Hmm...what you can do right now is to be her frd...but you can
still give her the concern of a bf. No phyiscal contacts like a bf
though. 
Forget about spending money on expensive stuffs...it's the thought
that counts.
I could read that you like her alot, so I'm not going to ask you to
give up on her.
Instead, I would like you to see
situations from her angle. Put yourself in her shoes instead, if
your actions are going to put her in a difficult position...by all
means, avoid those actions. What she needs right now is not you,
she needs to regain her parent's support.
Continue to be her frd up to the point of becoming her close frd,
treat her like your best frd and you will do fine. Remember...I
said frd, so please limit your rights to frd only and not bf. But
you can still show her your love while you are still frds.
Tell her that you still like her...if you still does (Don't do this
often...only occasionally and perhaps rarely when the moment is
correct).
And you would rather be her frd than not in
her life at all...agree?
So go ahead and be her best and closest frd. I'm sure
she won't mind to be frd with you at all. 
It is really difficult to find someone that you truly like in this
wide crazy world, and I'm happy that you have found yours.
Good luck and all the best to both of you. Be
patience and when things don't go well...remember that you are her
frd and not her bf, so don't go and analyse her single day cos it
is definitely going to make you a miserable boy.
Give her a call if you miss her and be honest about
yourself, honesty brings out the real frd in everyone...including
you. 
It is definitely not going to be easy for you, but think of it this
way, if you are not there for her...how would you have felt if
she's in trouble or having problems in the future? 
Be there for her, for yourself and her. 