Personally I would give her Arnica 30 for a day at 3 x a day , if no imptovement and the toe is very balck go onto Ledum 30 for a couple of days. Then go onto Symphytum 6 3x a day for a couple of weeks. Symphytum heals fractures in up to half the time as it usually takes. However before the Syphytum you must check that the toes are set in the correct position as otherwise with the symphytum they may heal wrongly. The Arnica gel is fine to rub on but I've never seen much success with it topically!!
Incidently don't worry about your Mother's case history as this is an acute situation so you just prescribe on what is there.