What size for a woman’s bike

We have been looking for a new hybrid bike for my wife.

She is 5’2”

All the bikes that we have seen have 28in wheels.

What would be the best size bike for her and wheel size? Anytime she sits on a 28 inch wheel bike she cannot hold herself up. She’s on her tiptoes just sitting in the seat.

I’m guessing XS frame bike. But does wheel size play a factor?

We are looking in the sub $180-$300 range.

Any suggestions? Only seen some scwinn models in some random stores like sierra.

They don’t see to have many options online.

Are nishiki any good?