The lady can take it, but I personally wouldn't.
I agree with getting someone who can't win to draw to avoid just this situation in the future. I think she can keep the baskets, but should acknowledge that it looks unfair, assure them that it wasn't, and then proceed to tell people how they'll avoid a repeat in the future.
While it may suck to watch someone walk away with 2 baskets, chance tells us that it shouldn't happen regularly unless the person buys many, many tickets.
And if a person does buy so many more tickets than anyone else that others don't have as much of a chance of winning? That money goes towards the retreat. If that person didn't buy all those tickets others would have a greater chance of winning, yes, but the fundraiser wouldn't make as much. And isn't that the ultimate goal?
But I think it should all be looked at as a way to increase the raised funds. If people grumble about others winning too often, they may stop buying tickets and the fundraiser loses money. Then new rules should be enforced.
But I'd probably consider something like upping the prices of the tickets after someone bought the first few. After determining that average number of tickets people buy. If people, on average, buy 3 tickets, then everything after that can cost more.
Tickets 1-4 cost $2
Tickets 5-7 cost $5
Tickets 8-100 cost $10
Because, personally, if I was told I could only win one basket I'd only really enter for one basket. And I'd spend less money. Because if I won basket I didn't really want then the one I did? Would I get to choose which one I want? Or will people grumble about me picking and choosing? So they'd make less money off me.