Hard to say what might happen ... the only two scenarios I know of examples are:
Mariah could lay and incubate with new mate - that happened here when T-Rex replaced his father Pop mid-incubation
Mariah could lay and abandon her eggs - not sure how likely that is or the exact reasons/timing for it - I do know that it has happened, though not here
In any case, it would really take a DNA test to know who is (or isn't) the Dad.
My advice for what its worth is don't worry about who the father is, just keep your fingers crossed that Mariah finds a replacement because she can't raise the chicks by herself - she can't leave the chicks alone to be able to hunt enough to feed herself and them, particularly in the first 10 days when she needs to regulate their body temperatures. She is on the territory and defending it no doubt, so with luck, she will attract a passing male (and I have only started to see reports of migrating falcons - American Kestrels mostly, only a couple of peregrines - at the hawk watch locations in the US) and this year will not be a lost year for Mariah and her fans in Rochester ...