Given that she is having diarrhea (with a little blood) and an increased appetite I think it would be best to take her to be seen by your local vet. They will need to do a fecal parasite check to ensure she doesn't have parasites (worms, giardia, etc) that could cause diarrhea and change in appetite +/- vomiting. Depending on the results that may place her on a dewormer or other medications like metronidazole for the diarrhea. They may also recommend doing bloodwork but most likely she either got a parasite or got into some other food that upset her intestines causing a bacterial overgrowth that she's not able to get over herself. You could try her on a bland diet for a few days to see if this helps but typically if it's been going on for more than a few days you'll need some form of medication to get things back to normal.
1) One option would be a veterinary prescription bland diet called Hill’s I/D or Iams Low Residue.
The second option would be a home-cooked bland diet. A common bland diet is boiled white rice and either boiled chicken, hamburger or turkey. Make sure it is boiled to get rid of any skin, fat, and bones that might be present. Offer the meat with mixture of boiled rice – 1/3 meat and 2/3 rice.
If the diet is tolerated and stools improve, and once diarrhea resolves, then it is recommended to SLOWLY transition back to the normal diet over 3-5 days
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