I'm gonna have to disagree with Syvlangod. We've got a good idea of how tcthetorturer feels about this situation and what he's hoping for, but we don't really know what the part-time sub wants from her relationship with him. It's foolish to assume that everyone who likes BDSM is heavily enough into it to want to make their life revolve around it, and since we don't know how big a part of the sub's life it is we shouldn't advise tc to try pressuring the sub into making a certain decision. The girl's life is her own, and tc made the right decision by letting the girl get on with her life instead of trying to pressure her into staying.
The advice about online domination is good as far as it goes, but personally I'd just go with using it as a way to keep having a bit of fun, not trying to use it as a tool to help maintain and define the relationship. It's far better for the girl to do her own thing and make her own decision (and judging by the bit about the contract, she'll probably be coming back anyway) than to just assume that everything will work out for the best as long as tc ties enough strings to her.
Or to sum it up in one sentence: people's BDSM lives and people's everyday lives aren't necessarily the same, and it's best not to make any assumptions about which part of someone's life is most important to them.
rallan