Why is it always me?

While out in the driveway, unloading some stuff for an upcoming garage sale, I heard a faint and high-pitched mew from the other side of my car. I walked around and here is this adorable little cat. My friend and I say, "Well hello, what are you doing here?" At which time she comes slinking up, rubbing up against our ankles and being sweet as can be. I lean to pet her and notice that she has full teets, so obviously there are kittens somewhere. However, she is so skinny and I can't bear it. She may be another species, but she is a mother and I can't turn my back on a mother in need. I went inside and popped open a can of tuna and mixed it with some dry cat food. I took it outside and that little girl tore into that food like she hadn't eaten in days! She was SO ravenous that during her meal she spied a dragonfly buzzing by and stopped eating long enough to leap on and immediately eat the dragonfly and then returned to her tuna and cat food. I let her eat and went back inside, hoping that she would get a full belly and make her way back to her kittens. Yeah, no such luck, she has been sleeping like a log in our flowerbed all afternoon and she partook of some more dry food when I took it out for her. I am worried about the babies. Are they around here in bushes somewhere, are they in someone's house and she just got lost while hunting dragonflies, or did she and babies get booted and the babies didn't make it. So I am at a impasse. I can't fetch her up and take her to the humane society and risk the lives of the babies, but I worry about her roaming the streets, there are coyotes in our area and cars. So, I guess I just sit and wait. Maybe she will get a full tummy and some much needed rest and make her way back home tonight. I can only hope. Or if she needs help, I hope she feels fed and comfortable enough here to go get them this evening and bring them here, then I can take them all to the humane society. It just sucks, all stray animals within like a 5 mile radius seem to gravitate to where I am, they must know that I can't overlook them, I just don't have the heart. Some psychic or karmic vibe that I send out letting all little animals in dire straits know that I am a big, fat, sucker! I'll keep everyone posted this latest saga!