One thing to check...when you were feeding the wet food...did you feed the cat different flavors each time?? Cats' stomachs tend to be sensitive to different foods if you don't mix them right. This is what I do & perhaps it will help...number one...try a different brand or if she likes the brand...don't mix the flavors all at once...This is what I do for mine & you can follow along how you like: I buy enough for a week, 2 per day plus some dry for her to nibble on if needed. This should work w/any brand but for me, I buy Fancy Feast...I get a variety of flavors but enough of each flavor that I'm not giving her a different one each time and I feed it to her like this (2 cans a day & switch every 2-3 days). I also stack the cans in this order too so I'll know what I gave her before & what comes next..i.e. 4 tuna, 4 tuna/chicken, 4 chicken, 4 chicken/beef, 4 beef, 4 beef/chicken, 4 chicken, 4 tuna or some other flavor of fish like whitefish or tuna/shrimp & occasionally for a change...trout, turkey, chopped grill or something else she may eat. I normally reserve the chopped grill if I give a drastic change like from tuna to beef, I'll feed the 'grill' between the two (tuna one day then grill the next day, then beef the next day) IMO, doing this eases the cat into different flavors w/o overwhelming her tummy & so far, it's worked for the past 14 years. Also, sometimes I mix it up w/gravy or no gravy like for Fancy Feast, they have 'classic' which looks like the normal canned dogfood texture, grilled w/gravy, sliced, etc. My cat doesn't have any teeth so she doesn't get sliced unless it's by mistake. There's also some brands that offer 'heavy gravy' or 'marinated'. I tried the marinated once & it made mine sick so I didn't get it anymore. Sometimes cats can't tolerate this special gravies so that's something to consider also. My cat LOVES cheese so I get the FF w/the cheese most of the time if they have it avail.
My point is...cats generally cannot eat just any flavor every time they eat...they have to have it gradually changed up. Same w/dry. If you switch brands or types of dry, you should mix it w/what they were eating already so you can ease them into the new...Try the way I suggested & see if it helps. Also, for dry, try an indoor hairball formula too. Also, someone mentioned grass..cats (and dogs) will sometimes eat grass to settle their stomach or to gain some nutrients they may feel they need. Cats can also vomit if they eat too much. They normally should only eat 2 times daily. I leave a little dry (not a whole bowl, just maybe a small tiny handfull or small quarter scoop just so they'll have kibble to nibble. Also, if you get the 'larger' cans as opposed to the 'smaller' cans, try feeding just half the can at a time, she may just be getting too much food...Hope this helps, good luck!!