I was going to say there shouldn't be anything to stop you from finding her again, but on line 5595, if blairquest > 1, then she should be a somewhat frequent spawn. The issue is the check is for if blairquest is >, not >=. This can be fixed by talking to Maeve (the bartender) about blair, in which case the flag will increment by 0.25, letting her spawn again.
Alternatively, you can try to hunt Blair with Nico, which you can do from the dialogue menu with him anywhere (despite the inherent strangeness in going to hunt Blair immediately from the fishing boat). This only requires that you've met Blair at all, apparently, so it should be fairly accessible.
In case neither of those options work, you can edit your save to set blairquest to 1.01, which should resolve the issues.