Scenarios .... keeping in mind that Trey arrived on March 31st in 2008 when Ivy pulled this stunt before. Trey could turn up anytime in the next two weeks and it would still be in the normal return range for Manitoba.
If Princess accepts him, Jules will hopefully find another mate this year - there are usually birds flying through/by so not an impossibility.
If Princess doesn't accept him and manages to hold her territory until Trey or another male turns up, then Ivy would probably end up back out west with Jules.
If Ivy and Jules decide they want the downtown territory, they will have to force Princess out and hope Trey doesn't return.
Such a peaceful time is Spring ...