Lisfranc's joint is the joint where the mid foot attaches to the long bones in the ball of the foot through which the toes attach to the foot. This is also known as the tarso-metatarsal joint.
A Lisfranc's dislocation is where one or several of the metatarsal bones become misaligned with the bones of the mid foot. Small chip fractures are often associated with this condition, but the biggest problem is the dislocation itself, which can be very debilitating when left untreated.
A non weight bearing cast may be attempted in some cases, but in the majority of cases surgery is performed so talk with an orthopedician.
You can use ice packs and ibuprofen to relieve her of the pain till then.
Thankyou Dr. Vinod for taking the time to reply.