Okay, first up - you don't *need* any connections at all. I'm quite unusual on MH in that even after 7 years I still find connections awkward and confusing and most of my characters have fairly stand-alone sheets. They'll have the odd friend or relative mentioned, but only a couple of them are actually affected by the lives of other characters.
Secondly, as for creating a maternal EFB, you can do that in about five minutes if you can't find a suitable family to connect to. Pick middle class or lower for that family line and you can leave the history blank. Alternatively, see if you can connect to the Regan family in some way, seeing as two of the Regan family drivers already replied in your sandbox

They're one of the biggest played families on MH, so you'd have no shortage of friends for Aislinn that way.
Above all though, don't let the connections thing stop you from finishing the sheet. The majority of new members make their first character without any connections at all, so don't worry too much about it. You
can finish this!
~ Car
ys