Am I nuts for doing this?

[mom-in-alberta]

Sure I would meet with Grandma and give her the tour. I would also state that you are advertising this space and if another suitable client appears they may be considered for the spot. In other words, Mom/child should make the trip to meet you soon.

I second this... and what everyone else is saying.
Sure, meet with her. It must be tough to find a childcare arrangement when you are not in the same town.
But no guarantees until you meet everyone and have all the right paperwork in hand.