Should I be offended by my friend? (her children, mother's day mentioned)

Hi everyone. So I am in my early forties. I wished my friend a happy mother's day and asked her about her two year old and newborn baby. She and I have talked about fertility issues for years, I guided her to help based on information I got from this board. I do not have children and do not know if it will happen.

So she texted back about her children, which was fine, but then she wrote a text that upset me.

She wrote, I want 3 kids, do you think I can do it?

Okay, am I right to be upset about this? Is there any chance she was trying to be cruel on purpose?? She and I are the same age. Was she just being careless or what? In general I do not tend to be jealous of people, even if I am really hurting for some reason I just don't really get jealous per se. But insensitivity DOES upset me. I don't think I would ever say that if the situation was reversed.

On a positive note, she had IF issues for years and then finally had her first child at age 39 and now her second one at age 41.