Actually, Charles didn't "shut it off." It's been awhile since I read the issue, but if I remember correctly the way he put it, she was never able to truly mature her powers because they were trapped in the nascent stage due to the initial trauma she suffered from her first use of it. He was able to clear the psychic residue holding her back, so she was able to develop her powers into the stable and controllable stage it is currently in. Something like that.
In any case, she has shown that she can still control her powers in Uncanny Avengers after Charles' death.
SPOILERS AHEAD
Specifically, in Uncanny Avengers #5, she kisses Havoc without absorbing him and she is even able to absorb Wonder Man without harming him, which she couldn't do before, demonstrating that she has even more control over her powers.
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So... yeah she can still control her powers.
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