@LinH
I fear you may not know as much as you actually need to know, perhaps less than you think you do. In summary
- there are NO fresh bovine valves, they are all leather - dead - inert ...
- the reactions you are reading about are from LIVE virus, vaccine is dead virus matter which allows the immune system to learn about it and then respond fast enough to a real threat (a dress rehearsal so to speak)
- the bodies response to the "fillers" as you so incorrectly call it are just that, not to the valve. Reactions of the immune system are specific to tissue types
you worry about side effects, you should be more concerned about "the real deal" ... that's probably fatal if she gets it
Life is a risk ... if you truly don't understand these things you should put conspiracy theory aside and trust those who know something more.
What do I know? Well if I told you you what would it matter? You don't know me, but you know the medical staff involved. Why not trust them?
Best Wishes