numbness in toe

I have scrolled through all the messages and found several dealing with numbeness in the big toe.
I am curious if anyone found help with this.
The doctor on this site doesn’t even give possible causes which I found frustrating.
My daughter works in a remote resort and cannot get out to see a doctor easily.
For the past week her big toe has been numb.
She works on her feet most of the day (7-8 hrs) and has new slide in open-toe shoes, with a slightlyl high heel, which she sometimes wears when she wears a skirt.
First only the tip of her toe was numb, but it seems to be spreading down her toe.
She has tried to massage it, and we recommended she not wear the heels to see if it helps.
Is there a chance this will clear up on its own, or does she need to see a doctor – there is no podiatrist in our home town.