Yur mother needs to see an allergist who is familiar with the desensitization protocol used for this.
it requires alot of premedication with antihistamine followed by an inpatient treatment at a slow rate over between 8 to 12 hours. here is one reference
I had a reaction to carbo during my first course of treatment (not til round 6). After recurrence, we tried cisplatin and again, at round 6 a similar reaction. Now, becaue the platinum drugs worked so well, we are doing a desensitization protocol, which involves, in my case, 1/1000 dose over an hour (so far no reaction there); 1/100 dose over an hour (2 times now I've reacted), then 1/10 over an hour (again some reactions); then full strength over an hour. I know that there are difference protocols for densensitization (some 8 hr - some 24 hr), you might check with your Mom's doc to see if she thinks it might be a possibility, if she could tolerate it. I now have my treatments in the hospital - just in case of a severe reaction. CA 125 almost in half (after 3 treatments) - CT next week to see the pictures! Round 4 scheduled following that. I wish you and your Mom well - might help to know ... I am 6 years from initial diagnosis - Still fighting!
I left a comment for you on the community support forum. My story is similar to jolene's. I am almost 5 years from initial diagnosis and also go through a densitization protocol. If you like, you can read the details on my response I posted to you on the community forum. Please let us know what you do. We are pulling for you!