I'd suggest using a digestive enzyme. It will help produce a more normal stool.
I'd also suggest a more holistic diet. Purina, even the vet formulation, isn't a very good food. Try checking out one of the human grade foods, especially the high meat content ones.
I'd also consider that you stop using dry entirely. Dry food is designed for human convenience and isn't really good for cats to eat. In most cats, this isn't an issue. But if there's a digestion issue, it's best avoided.
Hi Snowball...I am sorry to hear that Frenchy is having problems. If she is truly not eating, she needs to see a veterinarian immediately!!
Some pets simply are unable to effectively express their anal glands. Eventually, these will fill, become uncomfortable for the pet and sometimes even rupture. Obviously, ruptured anal glands are quite painful for the pet.
Some veterinarians will teach you how to express Frenchy's anal glands on your own. This may help to alleviate excessive build up in the glands and potentially avoid any ruptures or infections.
If this has happened four times in this past year, you might want to consider surgery. It may sound scary, but it will help to alleviate her discomfort.
Take care
Tomcat