You know...in essence, a best friend with "privileges" is the same as a girlfriend...
In my mind it is...

So...maybe if she'll be a good friend with a side dish...

If she's set upon goals in the future...and really wants to follow through...then you really don't want to hold her back from that, later on you'll really regret holdering her back. yada yada.

Lose lose situation, just the thing is picking the loss you don't mind so much.