My crush is heartbroken, what can/should I do?

The situation:
She's my friend, and I have a massive crush on her.
She was in a relationship until recently where they broke up, and she seems very heartbroken about it. At the same time she's also dealing with stress due to university and exams

What I'm doing:
I'm trying to be there for her, and support her through this rough period, without trying to hit on her, and she's accepting the shoulder I'm offering.

Why I need your help:
I like her very much, but I don't know what I'm allowed/not allowed to do. Can I tell her about my feelings while she's so stressed out? When can I? How can I know that the time is right?
and girls, can you please give me tips? What would you want your guy friend to do (to cheer you up) when you are heartbroken? and is there something I can do, that could make her like me, or at least agree to see me in that light?
My crush is heartbroken, what can/should I do?
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