I've been going through chemotherapy as recent as two weeks ago. I have two bearded dragons, a uromastyx, and a leopard gecko that all live in my house with me. I handle them everyday and do daily cleanings,
bathing, and snuggling. I haven't had a problem with any of them negatively affecting my treatment. If anything they've improved my over all well being and will to fight just a little bit harder. Taking care of them every day for most of the day keeps me busy and gives me a lot to do and look forward to other than doctor appointments and going to treatment. With any animal there's always a risk of bacteria or infection when dealing with their care, so washing hands and cleaning properly is a must. I wash my hands too many times in an hour, I always clean up poop as soon as it happens instead of letting it stay in the cage, and I know my reptiles are taken care of healthy and clean! It's really up to the person, this is only my experience. If someone else was in the same situation but didn't clean and sanitize properly they may be prone to getting an infection. My Oncologist has asked me not to get in to breeding and dealing with large quantities of eggs, he thought in my case that might be too risky. In my honest opinion it's up to your Mother, if she knows you take care of your beardies, and she washes her hands I don't see much of a risk. But I am no doctor and could be wrong.. I love having my beardies by my side through all of the sickness and pain, they comfort me in such a way my family and friends can't. Good luck to your Mother and I hope everything goes well for her.
-Kaleen