Calling all cat lovers 🗣

We adopted a cat a year ago so I have a little familiarity with them BUT we have a stray cat who lives under our home. She appears to be pregnant and maybe ready to pop soon. I want to be able to help her. A neighbor has been feeding her and we provide buckets of clean water and check on her but she is a little scared of humans. I’d really like to help her kittens when they arrive but I have ZERO clue on what to do. Any advice or thoughts welcomed.