You might try one of the SIDI models (there's only one or two, however) for women that come in a "mega" or extra-wide version. Otherwise, I'd suggest trying to shoe that is known for having a slightly wider toe box. I've heard Carnacs do, but I'm never tried them myself.

SIDIs reputably run small. Just about everyone I've talked to had to go up a size from what they would normally wear.