just hoping that she'll agree to go for some professional help,
and continue taking her medications
I'm not sure what to say about her use of the computer - is it more than a "habit"? Is she is any danger by this internet character (the Facebook guy)?
And for yourself - sounds like you have your hands full with the costs of things. Could you cut off the computer service (if it isn't available, then no body can spend hours on the computer), or agree to some limits about the length of time it is used by any one person? I'm not suggesting any attempts to control another person. What is reasonable?