The only thing I'd worry about, if she can't get a loan of her own, is how she'll be taking over the mortgage. BC, if you have a loan with your bank and they have a mortgage over the title, even if your sister is making the repayments you're liable for the debt and if she stops the repayments you'll be the one in default. You'll still have to note the debt on all your other loan applications etc.
Also, you can't transfer the title to your sister unless she is willing to guarantee your loan - if she's not eligible for a loan of her own this will be hard to do and banks don't generally like it. Essentially I can see you having the debt/trouble while your sister gets to do what she likes with the block, so I'd definitely go see a lawyer.
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