Tough call, as everyone interprets her voice differently and I don't want to spoil anyones head canon. I think Arleen Sorkin has a good mixture of cute and annoying,as is appropriate. When I write her dialogue I seem to imagine something between Jane Jacobs and Carol Kane (using the voices they use in Day of the Tentacle and Transylvania 6-5000 respectively.) but its hard to pin down. A lot of people have her voice in their head but they can't piun it to one that exists, and I think I probably feel that way too.
If she were an anime, she would probably be voiced by Kaoru Mizuhara