Friend, I am sorry that you are having this problem with Chica. In response to your question, when we see the belly being bloated this could be a sign of an underlying medical condition. It will be difficult for me to determine the exact underlying cause without a hands-on examination and some testing. But, common causes are fluid build (ascites) secondary to low protein, heart disease, kidney or liver disorders, and tumors, etc. to name a few causes. Treatment for Chica will be based on knowing what is causing the abdominal distention. Unfortunately, there is nothing I can recommend for you to try at home that would any significant therapeutic benefit, I am sorry. I would strongly recommend having her checked by a veterinarian as soon as you can. Besides a hands-on examination, she may need blood work, urinalysis, and x-rays as an initial screening test to determine the exact underlying cause.
As far as the lameness, this could be a completely different problem like a soft tissue injury, arthritis, hip disorders, etc. Or, she could be weak because of being ill from one of the above-mentioned diseases. Upon examination by a vet for the abdominal distention, they will also examine her leg and see if this is a different problem.
I realize that this answer may not be entirely to your liking, and I regret being the bearer of information that you really don’t want to hear. But it would be unfair to you and unprofessional of me were I to provide you with anything less than truthful and honest information. I hope you understand.
My goal is to provide you with excellent service - I hope I've provided the information you were seeking, if you feel you have received anything less, please reply back as I am happy to address follow-up questions. Kindly rate me when you are done.