First, welcome to TCS. We are glad you found us!
Now, since Momma seems intent upon moving the babies around, let's do this ...
Let's get a nice, roomy box (you mentioned you had a crate) and line it with a few old towels you won't be needing. Place it where she is NOW, hopefully, nursing the babies. Do a head count to make sure you have ALL the babies in one place. Cover the box with a blanket to make a nice, warm, dark nest for her and then leave her alone. Don't be going in and out to check on things, this will make Momma anxious and nervous. Just check about every couple of hours to make sure she is nursing and lying with her kits.
It is normal for her to get up and move around some. You will want to place her food, water and litter tray all nearby but not too close. If you can confine her to one room with a door that can be closed off from the rest of your home, that would be preferable. Just make sure that you do a walk-about the room to ensure there are no unsafe places where she can move the babies - you want to be able to get to them in the event you need to.
When you can, you might want to run past the grocery store and get a couple of things to have on hand ...
A couple of containers of Goat's Milk
Several jars of meat-only baby food (no onions or other veggies), I like chicken or turkey
Several cans of a high-quality wet food in the kitten formula
A good, high-quality dry food, also in the kitten formula
When you get back from the store, gently warm the Goat's milk in a dish (you can use the microwave, but test the milk before giving it to the cats ... you want it warm, not hot) and offer it to Momma. You can also gently warm a little of the baby food and give that to her as well. You can give these things to her once or twice per day. She will need the extra calories and protein to help her have enough milk to nourish the kittens. If you haven't already, start feeding Momma the kitten food. She needs it now.
We are all here to help, so don't be shy about asking questions.