>>5 is paranoid.
OP< if you want to spend more time with her, then ask if that'd be alright with her and see what you can work out.
If you're really just wondering about her interest level, then ask if she'd like for the two of you to meet up more often. Perhaps it isn't that she's busy, but that she thinks you might be, that you might enjoy your time alone, etc.
Then again, maybe she simply enjoys her time alone, or something similar.
Are funds an issue?
There are a billion possibilities. Talk to her.