I think the flowers and the cake and/or cupcake will be great, she will love those!
I'd probably do the ears just for Helen. And then of course make sure your mom gets her celebration button.
I've read somewhere about a place called Jellyrolls, on the Boardwalk? If you sit next to the piano's you can put in a request for songs & let them know its a birthday celebration. I think it said there was a cover charge but not sure how much, but I know people have said great things about it.
I know you can also order those Disney gift baskets but they were a little pricey when I looked at them.
i also found this thread:
http://www.disboards.com/showthread.php?t=751989
Whatever you do, I'm sure she will love it!!!!