My 87year old mother was walking down slight ramp her knee gave a and turned. Sharp pain, with help after a few minutes we walked tighter to car. She has pain from hip to foot. Ankle sore slight swelling. Right knee has golf ball size swelling below and to the right of knee cap. Pain goes down toward shin bone. We iced, she has taken over counter napersin /alieve. She is in bed now, cold pack resting on towel around back of knee area. What do I need to be watching for?