reform the relationship bonds in question?

permanently affect the vampire's ability to form an evaluation of the target in question, regardless of future experiences, and that's a bit more of a durable effect than is usual in this fic. If that is true, does Chelsea's power have a time limit?

Chelsea changes the attitudes people have towards others. These revised attitudes are as durable as they would be if they'd formed naturally, once Chelsea is no longer touching them up on a regular basis. So, if she's completely destroyed an existing relationship, the participants in that relationship have to start from scratch, as it were.

There is no guarantee that what they build from scratch will resemble what Chelsea destroyed.