The neighbor's cat

Our neighbor has several cats roaming around. My kids can tell them all apart, but me, not so much. But I did notice a few weeks ago that one looked pretty pregnant. We've been keeping a close eye on her. Two of the other cats had kittens about two weeks ago in our neighbors house, and I didn't even know they were pregnant. Anyway, the one pregnant cat that I noticed has been acting like she is in labor since yesterday afternoon. She rarely ever lets us get close to her, and yesterday she started meowing really funny, and very frequently and wants us to rub her. She wants to stay very close to Sammy (our dog) and you can tell she wants Sammy to love on her. Well, I thought for sure she would have her kittens last night, but nothing. So then when I went to bed I thought I would wake up to kittens. No again. She keeps hanging around here, laying with Sammy and meowing like crazy. But still nothing. I've taken a laundry basket and lined it with old towels for her to birth in, and she will occasionally get in there. But I'm worried she is having trouble. I really don't know anything about cats, so I can't tell for sure she is even in labor. But it sure seems like it. Anyone have any advice??