E.S.
There are multiple reasons why she is having so many. If her doctor didn't say anything, I can't imagine that it is something bad. If she is older or if she has multiple babies in there, etc are reasons why they would do more. I had a TON of ultrasounds because of having twins. They must consider her high risk for some reason. Maybe it's something she wants to wait before telling anyone about or maybe the doctor hasn't said anything yet. I would ask the doctor flat out if I were her.