There are other magical explanations of this. It sounds a bit Svengali to me - not exactly the same but hints of it. When we give things to darker entities (usually things they can't get from the mundane world themselves) in a pact we usually get something in return. Now it sounds as if She wants you as a servant. But you don't say enough about the pact as to how or why?

Twin Flame is just one of many sets of beliefs, a fashionable one currently. Choosing it as part of your path is of course up to you. She might have chosen you as her servant or acolyte on the Earth side. It may just be wishful thinking. You must decide.
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