If her family is that critical of her, she may be getting married to escape an unhappy home life. She may also be looking for a daddy for her child or feel that because she already has a child, few guys are going to want to saddle themselves with a pre made family. Sounds like a lot of reasons to rush into marriage.
She should spend some time really thinking about all of that and as her supportive friend, not critical like her family, you should talk to her about just being sure she wants to marry because she truly loves this guy and not to escape home or simply to secure a family for her child.
