If you haven't made a back-up of that game slot file then I recommend you do it now. And if the Family Tree doesn't show her having 6 kids then hopefully you'll get an adoption event.
My Generation 30 was fine, it was Generation 31 that didn't get any proposals so I installed the updated version. Then I had to do something different to restart the 31st Generation but at the moment I don't remember what it was.
I just found an older post I made:
The game displays a message stating something like "there is not enough room on the family tree and so the first family will be removed from the tree to make room for the new family" and asks if it's ok. I only saw the message once so I don't remember exactly what it said word-for-word. However, if you don't give it permission then consider this to be your last generation because your peep will not get any marriage proposals or adoption events.
Was it simply clicking the Next Generation button that gave me that message? Does anyone else remember what they did to restart Generation 31?
If you never saw that message then I'm thinking that your game is not yet using the updated files. Just a thought.