Hi Dentoncharlene
My daughter is in the EXACT same boat as yours!
She is 27 weeks today and is really trying to crawl so hard! She does get around very well by 'army crawling' - only backwards. And she can get her legs up under herself by herself, then rocks, but usually ends up falling face first into the carpet. Which she doesn't like.
I've read to put toys just out of her reach or lay on the floor with her (way in front of her though) and try to get her to come to you. I have tried that and all it does is p*ss her off! lol

She likes me right there so she can 'crawl' up onto my lap.
We just saw her pediatrician yesterday for her 6 month shots (we're a little behind) and she said any day now.
DD just recently figured out how to get from a sitting position down to laying on her tummy. And she's also been 'standing' since 3.5 months. And for the past 3 weeks, she's been pulling herself (from sitting position) up to standing while hanging onto her stationery toys. Everyone keeps telling me that she's just going to skip crawling all together because she loves to stand.
I'm sure in the near future your dd will be cruising all over the place! Get your house baby proofed if you already haven't!
Just wait it out, that's about all you can do. Crawling can happen anytime, but usually between 7 and 9 months. So your dd is right on target if not a little early.