This is way too much.

I'm down for dissipation automatically resummoning the previous fairy.

Everything else is too OP and would break the balance of healers.

I don't think Silent Dusk needs to be reworked into a completely different skill, it just needs tuning:
-Act like an oGCD - not affected by whether or not Selene was or is doing something
-Its range should be the same as Embrace's - so that way a person knows that if Selene is in range to heal the tank, she's probably in range to silence what he's tanking.