Humane society dismissing sick cat

8 days ago I picked up an 11 week old kitten to help socialize. She was very scared and we followed every guide. She was not food motivated and barely ate.

They took her in for a spay on Wednesday and I expressed my concerns Tuesday night via email and in person Wednesday. Was asked to please keep her. Well she hasn’t improved any and now has eaten probably 30 calories since Wednesday night. Maybe 100 since I’ve had her 8 days ago. She won’t even eat warmed tuna!

Emailed them an update yesterday and they said to contact them if she didn’t eat and they’ll get me on the schedule today to see the vet.

Well emailed them last night at midnight an update and said I could come any time and they ignored me. This morning her poop is pure liquid.

This cat is sick and not okay. What do I do? They keep just telling me to try new food. I’ve tried at least 5 different types of meat and changed them up and everything. Should I just go drop her off and make them take her??