Aurora,
I haven't heard from Becca on my full yet and it's coming up on the four-month mark, though I read earlier in this thread that it is typical for her to take 3-4 months to read a full. My biggest concern is that she didn't receive my MS because the other agent who asked for my full sent a confirmation that she received it, though I hear it isn't typical to send a confirmation. I just remind myself that anxiety over whether or not an agent received your material is part of the query process : ) From what I've read, she seems like a great agent and a really sweet person, so I'm keeping my fingers crossed.
Filigree, I think you should go for it. Her bio says she loves fantasy with a high-concept and broad appeal. The worst thing she can say is no, and at least you won't wonder if she might have said yes. Suzie Townsend has also requested a full from me (another amazing agent and very kind person, from what I've read), and her bio on FinePrint Literary Management's website says she's looking for epic fantasy, so maybe try her as well?