Pregnant bridesmaid

My wedding is in June, and I have a pregnant bridesmaid that’s due to August. I understand her body is changing a lot, so I’m okay with her waiting a while to order her dress. I am having my girls pick their own dresses from Azazie. I know for my own experience when I was a bridesmaid and for all the others they’ve chose different dresses than they thought they would so I want her to do a try on. I told her if money is an issue I am willing to pay for it, and she says it’s not, so please don’t go off on me that funds could be tight. I she has yet to try some on. She won’t really give me an answer as to why not. I wondered if it’s because she wants to see it on her closer to that time and she says no, I just haven’t thought about it. But I’ve been asking her for weeks. If she tries it on now, would it make that huge of a difference how it’ll look on the top if she changes her size to whatever size she is? I’m just thinking I wish you’d see which you like on your body, add something to visualize a bump. But would the pregnancy change the look on her so drastically that if she likes it now, she would hate it then?? If that’s the case I’ll humor her and wait, but if not I’d just like her to pick which she wants and order the actual dress later. I will say the ones she would like to try on are all fairly modest so I can’t see her ladies getting way too big that she can’t wear it. I’m just scared she won’t try until last minute and when she does hate them all and take forever finding one and end up not having one in time. I’d really rather her not stand up there in her normal attire of basketball shorts and t shirt. Thanks in advance!