ofcourse
I guess you should try to be Dan L’Kaf Z’chus the women and girls in the shul, because that’s the right thing to do.
Personally, I find it pretty embarrasing that such an incident can take place in a frum shul. It is completely unacceptable.
Where I daven, no girl would have the audacity to sit if there is an older woman standing! And if it’s a pregnant woman, you would find bubbies offering their seat to her!
This better be a one-in-a-million situation….