Is there any limits sharing folders?

I found the problem. There were errors when I invited her because she has already an invitation according to 'show people' folder option in icloud drive although she never received it. Every time I tried to invite her there was an error after a while.

Solutions was, remove her access (never accepted) and resend a new invitation to share folder.

This lead me to think there is a bug when you re-send an invitation to share folder to the same person.

Thanks, I followed this guide multiple times but it didn't work for me for big folders.