Some people have more adverse effects from vaccines than others. The reason she got sick was likely the side effects of it. It’s to be expected, because vaccines are usually literally just dead or weakened viruses being injected into your body so you make the antibodies to fight the full strength virus. J&J is the only covid vaccine to have blood clots and even then, it’s only 8 people reported. Pfizer and Moderns are the most reliable and effective.
Anyways, my point is you shouldn’t distrust vaccines just because you get “sick”. You should always expect side effects from a vaccine. Not everyone will get them but most will.