Momma cat and kitties unsafe

My stray cat recently gave birth again just three days ago. If you were following one of my previous threads before, she gave birth to her litter far away from our place. Luckily, she gave birth back in our car port. Now here's the problem: the car port is an open area so other cats can wander inside the area. Just now when I got home, I was told that one of the kittens was taken by another cat. Since the kittens are only three days old, is it alright to move them with their mom? If so, how should I do it?

If she allows it and you have room inside, please take her in. You can bring her nest inside, so she has a familiar place. Put her in a room, a spare bathroom, someplace where there isn't a lot of traffic. Even if all you have is a shed, you can use that. A large dog crate can work in a pinch, as well.

Keeping her confined is also going to make it easier to get her spayed. Hopefully, she gets used towering inside and can be easily taken to the vet.

Vibes she and the other kittens are Ok.

We have a spare bathroom in the third floor that hardly anyone uses. I'm gonna try that. But my fear is her being too confined. My sister is terribly afraid of cats so if we will be getting the momma cat to go inside, she's gonna have to be confined to just the bathroom to avoid them running into each other.

If the room has a window, she should be fine. She may complain but I'd rather she fussed a little than lose any more kittens (and possibly her own life). Tell your sister the cat is likely more afraid of her! She will also sense your sister's fear and being unable to figure out why, she will react.

Yet, I am hoping this may be the perfect opportunity for your sister to get over her fear!