It's a plus if she lets you brush her & she likes brushing time. I grew Mimi's hair bc she lets me brush her & she's used to it. Momo on the other hand has thick cottony tangles easily fur & he hates brushing. So, in the warmer months, I keep him in a short cut on the body.
As for tips on growing her hair, keep doing what you're doing. Make sure she also gets a good balanced diet. Foods w/omegas to keep her skin & hair healthy.
I think in about 6 months, it'll be nice & long.