My Dsis was very poorly a few years ago.
It just happened to clash with a series of things we had coming up.
She missed out on:
Her final class party (her teacher who she had for 3 years was leaving)
Saying goodbye to all her friends before the summer
Spending the last day at school with her best friend who was moving abroad
A close family members wedding which she was meant to be a bridesmaid
She was so upset. She cried and begged us to take her into school and to the wedding. There was absolutely no way we could take her anywhere.
Most children miss out on something they want to do at some point in their lives.
When she returned to school in September, she caught every bug going. Vomiting bug, coughs and colds etc. She had a very poor immune system for over a year after and just a cold left her in bed for a week. She missed the Christmas party that same year due to illness.
We wouldn't have taken her to any of the above events just because she wanted to go. She was ill.
However, it depends on your child and the school. You know her best. You know if she can manage.
YANBU to want her in the picture though BUT just incase she can't go, reassure her that their will be others.
I hope she is better soon