You could ask her why. She might not be ready for marriage or she may not be interested in marrying you.
Then you can decide if you want to wait for her to be ready or if you should move on and find another girl.
You simply don't propose because it's not the right time. The right time will come don't force it.
Learn about her family traditions and background and approach her father about dating his daughter, I think it will please him that someone respects him that way.
If she accepts then she will say 'yes' to your proposal. Hopefully!
Yes
Get on your knees and beg her please
Back off, if she has a bf, she's off the market! Instead, be he "go to" person, her friend. Be willing to listen to her when she needs to vent her feelings, in a no pressure invironment. Encourage her to work it out with her bf if she has a problem. This is a guy girls admire.
that means she likes you
she has daddy issues.
The easiest way is for her to simply say "No." She has no obligation to say "Yes." nor to explain why she rejects a proposal.
If you tell a girl that you love her and she refuses, become friends with her and try to be friendly not boy-friendly.
Go to a cruise
well basically she wants to sit on you or get your attention