Rebel's medical treatments

  We had gotten rebel at a week old. During that time I was severly ill and on bed rest (still am) . She had a lot trouble latching on her bottle. Luckly, I was home all the time and was able to give her the one on one care 24/7 that she needed. after a month she finally got use to "sucking" on the bottle(She wasn't fully able to suck on the bottle we had to help and squeeze it in) . At Her second visit to the vet they had noticed the sores/ulcers in her mouth. The vet wasn't too sure on what to make of it . She had never seen a kitten with sores like this epically this young. They think she was probably born with it or developed it sometime after birth.. and that's why she had so much trouble with the bottle. She is now taking amoxicillin trihydrate twice a day and probiotics once a day .Her one sore has gotten bigger since we first discovered it(both of them use to be same size) . They have also developed a reddish circle around them . We have transittioned her now to soft food. But the same troubles that she had with the bottle she is now having it  with the wet food. Eating causes her a lot of pain and causing her tummy trouble, GERD, and coughing. The vet had said that is all caused by her getting food esophagus and not digesting it properly. She is now 4 months old and still has on going medical issues. The vet thinks it would be best for her health if she goes through the biospies and other testing.  Due to my serious medical issues and treatments, We are unable to afford all that needs..We have helped her overcome all of her other obstacles that may have not looked even possible and we want her to live the longest, healthiest and happiest life possible with us. The Biospies and tests seems to be the only way possible to achieve that ,and we want to try to provide her the best care possible because she has helped me get through so much during my lowest point in my health so far ( with all of her love and care.. we truly have a special bond).
 UPDATE: unfortunately today(9/18/14), we had taken Rebel to the vet and found out she is indeed having seizures. They also said she has a slight heart murmur, Her sores have progressed greatly and she needs even more testing (FIP, Toxoplasmosis, a blood profile, etc) done. If she keeps having seizure so periodically she will have to go on medicine and and get more tests done. Right now Rebel is having them at least 10 times every night! Rebel is also experiencing lots of trouble with eating(even more) since the sores have grown so big. We are giving her Kitten Milk Replacer at night just to let her relax a little and have a break. We hope we can get her all the care she needs and give her the best life possible. We are truly grateful for everyones supports. It truly means the world to us and makes a world of difference for Rebel! .. Thank you!