I am also an Arizona native but have lived in many other places including Rochester. I have some observations:
She will probably love the Summer. Much cooler than Phoenix, a bit of rain in the afternoons and many very pretty places to visit within a couple of hours drive (Finger Lakes, wineries, farms of all kinds and roadside stands everywhere selling antiques and everything edible). I spent several hours almost every evening water skiing on Long Pond and canoeing on the old canals can be very relaxing.
She will probably hate everything else. Winters are terribly cold and snowy (especially if you go east or west). There isn't much to do during winter unless you like hockey or ice fishing. Phoenix has a world-class variety of restaurants - Rochester.....not so much although the "garbage plate" is reputed to be gastronomically exceptional according to my son's hockey team. Rochester, like the rest of Noo Yawk is expensive. Their native beer is terrible and their roads suck. You have a choice in Noo Yawk: two-lanes or toll roads. Neither are well maintained. There are more railroad tracks in the City of Rochester than anywhere on Earth (think Grand Avenue times 100). Both major employers have collapsed in the past decade (Kodak and Xerox) leaving Rochester financially destitute and with some severe "diversity" issues. Rochester's crime rates an 'F' by several agencies and appears to be worsening.
Just my 2 cents. Your mileage may vary.
My Dad worked for Kodak until we moved to Arizona.
My wife has absolutely zero interest in living anywhere it snows and it sticks for more than a day!
Even a visit is iffy!
I meant to say I was going to take her back there for a visit for all the summer reasons you mentioned. It is spot on.