Help Diagnosis Foot Pain

My wife asked me to post to see if anyone has any experience with the problem she has and any ideas on how to deal with it.

For over a month, she has had pain on her right foot due to running. It started with her Achilles tendon, but shifted around to the arch of her foot (inside edge of foot). It hurts while running, and it still bothers her post-run when she walks around. She’s a physical therapist, so she has had the opportunity to try ultrasound (not much help) and electronic stimulation (just started). She has been icing it a lot as well and running with some sort of ankle wrap.

She just did a half marathon and was hoping to do her first marathon in October, but she’s not sure she wants to put up with the foot pain.

Does anyone know what might be causing this? Any possible solutions? I think she should take at least a week off, maybe two, but she hates to back off.

Thanks!