It's a beautiful piece. These were a sort of multi cabinet and would house anything from clothes to kitchen items. Today most people use them as a sort of hutch or buffet, though I've seen some great re-purposing to wall units.
It looks to have low legs, rounded edges, simple pulls and what looks like a simple grain wood and if I'm not mistaken the doors are sort of rounded toward the sides. It looks like an art deco piece which would put the date around the 1930s / early 1940s.. A midcentury modern piece would generally have short pointy legs and would have use sliding compartments and doors. Pieces coming out of the deco period were more sleek and curved. If you're lucky you may find a matching or at similar armoire.
These pieces generally don't bring what they used to. Sadly, most big pieces of furniture don't because many either don't have the space or tend to go for more of the more modern, simple look. For a piece like that it's actually worth about $800 to $1000. I'm not sure what you were looking toward paying her, but a fair price would be around $400 to $600. That gives you both some negotiating room and help you to know what it's actually worth.
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