I think this is a Sag trait regardless of gender.

It's true. They hold high respect for honesty.
I have said I thought the only thing that ever really offended my Sag was a lie.
They keep it real. And for me, that was refreshing. I never had to guess.....
he told me "just ask...and be prepared for the truth".
I valued that I always knew where I stood with him.

If you really like this girl, just be honest and tell her you are interested in her/ attractred to her.
That opens the door but doesnt imply expectations.
She will more than likely let you know right then if you stand a chance.
Even if she is not interested, she will respect your honesty and it wont interfere with your friendship (from her point of view.)

good luck!
there's never a dull moment with a sag, they are a fun bunch!