Unfortunately, there's not a lot out there. I have been looking for years to find something that isn't a scam.
There are some product-selling companies, as you probably know. Avon, MaryKay, Lia Sophia, etc. I know several women who love doing this. I am REALLY not a good salesperson, so they aren't a good fit for me. However, if you could find a product you really enjoy, personally, going that route might be a good way to make some extra cash. Make sure it's a reputable company - well known.
If you've been a nanny for 6 years, I would say you have more than adequate experience to watch kids in your home. You may not want to do this, because of the committment, but it's something you know how to do and do well. I don't know what all it takes to set up an in-home daycare, but I'm sure there are ladies on this site who do.
Our farrier told me the best advice he ever got was to take something you love to do and figure out how to make money at it. What about gardening? Could you take veggies, flowers, etc to farmer's market? Baked goods? Photography? My best friend has made a fabulous business in photography- the best part is that she loves what she does.
Since I was a nurse, I thought medical transcription would be a great way to earn extra cash. My hubby, although with good intentions, was pushing me to do this. I didn't do enough research and pretty much dove into one of the first schools that contacted me. Yes, THEY kept contacting me. Maybe that should have been a red flag. The medical course was a breeze, but the actual transcribing caused so much anxiety, I had to quit. This is my own personal failure, but I also don't think I was properly informed of the best fit. If I had to do it again, I would have gone with medical billing or coding. I have a friend (who I met after the fact) who does medical billing and really likes it. Also, some schools will do a much better job of helping you find a job after you graduate. The school I went with would almost guarantee you a job, if you forked over another $900!!! Many companies, offices, hospitals, etc want you to work in-house for at least a year or two before you work from home transcribing. If you decide to check this option out, do your research on the schools!
I wish there was a magic bullet, so to speak, as to how SAHM's could make extra money. Unfortunately, there are more scams than legitimate jobs. Good luck to you, I hope you find something!