What you're done is create a sexless long distance 'relationship' with her, which now (being made apparent by your facebook unfriending) you've been dumped from.

Like any relationship - official or otherwise - scars take time to heal, but let's be honest, no-one really ever wants to get back with an 'ex'.

When she says "give it time for the friendship to grow back", I hate to be brutal but what she's really saying is "I'm trying to let you down gently by making you think that you may have a shot in the future but really I'm hoping that with time you'll forget about me"

As per the advice you've already been given I'd have to agree. It's time to learn from your mistakes and move on to bigger and better things