Athlete not improving - some advice please

Thanks, on the ball, we do to its just we have had ice and snow for 4 weeks but going to try tommorrow night. Speed volume around 680 per week (2 sessions) (the 3rd session mostly med ball for power) at its peak and usually 2000m per week of tempo during GPP but that has been lacking for quite some time. I’ll have a chat re swimming, lives in a hilly area so not sure about easy bike rides, although a gym bike should do it, any experience in what’s best ?.

Her weight dropped from 137lb to 119lb, (5ft 3inch tall) by cutting down on empty calories, so I don’t think there is an eating disorder as it seems to have levelled off and shows no other signs. Thanks for this guys I appreciate the help, keep it coming please.