Hello mommy, does the incessant pinching and poking bother your baby till she cries? If it doesn't, I reckon it's not something to get too upset about.
I think your MIL is just excited to see her grandchild. Is your baby her first grandchild? And how often does she get to see your daughter? Some of these factors could contribute to her overzealous touching of baby's cheeks. I know an aunt who would squeeze my baby nephew's chubby arms and thighs every time she meets him and she always says, "when you get bigger, I've no chance to do this anymore." Some of these old people are mighty sentimental and they just can't help themselves around cute babies.
If it really bothers you so much, here's an extreme and non ideal way to deal with it -- tell your MIL that she's hurting your baby and if baby is hurt, then she might not be able to visit as much
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