I heard from a friend yesterday that after some research she did into why her kids suffer from allergies, eczema and ADHD and found that she was never warned about vaxxing when her kids were sick. So, I'd wait till you feel she's fully over whatever she has till you vax. Vaxxing does take it out of the body to deal with. As it is, I give my dog a fortifying 'remedy' just before his annuals because before I did the vax would leave him so flat, and his immune system is not the absolute greatest at the best of times.