We home school and I'm involved in helping with Smoothing the Way (smoothingtheway.org) South Austin which is a support group for 1st year home schoolers. Your question on curriculum is a favorite topic so you should get many responses.
One thing we recommend at Smoothing is to ease into this journey, especially with the health issues you cited, keeping it simple and not being overwhelmed is going to help you enjoy your time together the most.
Hope I can give you some resources. Texas Home School Coalition (I'm going to try to give you websites but if they don't work please google I tried to look the exact sites up while working on this and lost all I'd already typed :( so I'll try to give you key words to go by) www.thsc.org is an excellent legal source on how to go about withdrawing and they can tell you all you need to know about requirements. I read someone's advice about looking up the texas essential elements. Please don't feel obligated to do this. Be aware that home schoolers are private schools and not bound by them and do not have to take the TAKS. We are basically required to teach in bona fide manner courses in: Spelling, Writing, Reading, Math, and Good Citizenship. Every family I know exceeds this, we care for our kids, so we do our best for them. Anyway, this is a good source for legal information.
We primarily use Sonlight curriculum for reading and history, because of its excellent literature. It has a lot of wonderful fiction and nonfiction picks. Level five is eastern hemisphere, which balances the reading with some computer research. www.sonlight.com Dad loves reading to the kids in the evening and always asks what the next sonlight book is. This would be a wonderful gentle approach to schooling for someone in your daughter's situation: getting healthy while easing into full time at home schooling. (I thought it was expensive at first so I just took the book lists to the library...then my husband started enjoying the experience and knew how little time I had for hunting down books so we went ahead and bought a "Core" package. I couldn't buy the books seperately for what I paid for the package and it came with the teacher notes and a schedule for reading the books) Sorry, like I said favorite topic...get carried away :)
Another method for schooling can be found at ambleside.org or com. Charlotte Mason approach has wonderful literature suggestions.
Look in Rainbow Resource Catalog (about the size of a phonebook) for all sorts of reviews of curriculum and the rates they list for new materials are usually cheaper than found elsewhere (I think the next used curriculum book fair I know of is in May) (this is where things could get overwhelming, just breath and remember you don't need all the stuff to teach you have what you need, namely love and a brain: (and a good dose of the Holy Spirit helps too!)
Spelling: Spelling Power
Writing: We do family writing projects of all sorts; the girls do a writing club once a month; younger kids do Happy Handwriting and Cheerful Cursive. Writing Power is a good source. Grammar: I like A Beka (don't know that the kids do :) and Write Source. Vocabulary development Wordly Wise
Math: Making Math Meaningful (scripted...great on concepts), Mastering Mathmatics (straight forward, learning math facts), Singapore Math great for visual learners...inexpensive... Suggestion: since you're leaving at 5th is to see what text you're using at the school and if its successful continue in the series...if not go ahead and switch.
Good citizenship: History-Sonlight and Girl Scouts and Boy Scouts (we have some of each) Keepers of the Faith or Keepers at Home (be careful finding their website there is some rock group that has a similar name when you google)is something like GS that has projects you can do to earn badges and you can do it independently at home. Bible reading can also go under here too.
We add music lessons, a once a week PE class at Dick Nichols Park. We have a field trip co op.
We do Apologia Science, but have also done sonlight.
If this looks like a lot, remember I'm schooling 4 children right now (one who's in 5th gr) one child wouldn't use all the suggestions I've given
My biggest suggestion is to wait awhile before you choose a curriculum. You do not have to lock all these elements in right away, take your time before buying anything. Get to know what you like first and how your daughter learns best before starting to invest. This should be stepping into the slow life. (I'm listening to myself...I am listening to myself...I will slow down...I will slow down :) Anyway, it IS possible to simplify, heal and educate at the same time. Hope all goes well for you!