I'd advise her to not take it. The best way do gain muscle is to do heavy but short reps with long breaks and eat lots of protein.
Answer:
Yes...They can.
If this is another one of those true or false questions this would be "true"
Evidence shows that there are certain metals in some vaccines that people who have an allergy to metals can react, which can affect them neurologically. (i’m autistic myself and was affected by a vaccine. i hope this helps.)