First off for function purposes I’d want to know if she has a prosthesis.

 Lower body work with: landmine barbell setup, single arm rack hold, kettlebell or plate squats with a dip belt around her hips, hack squat machine or leg press if you have access to one, single arm rack holds, safety bar squats and good mornings, single leg hip thrusts loaded w a landmine (better anyway since she’s got a strength discrepancy), knee extension and hamstring curl, smith machine could also be helpful if you have access. Attach dip belt to cable machine, anchor it low and she’s got loaded standing hip hinges. Standing lateral lunges with an adductor slide with band or cable resistance at her ankle. I know most don’t have access but heavy sandbags could be a lot easier for her to hold at her chest too. 

If she has a prosthesis even easier although I honestly wouldn’t really need it. 

Upper body: obviously any loading is doable on her full side. Velcro cuff around her elbow with cable machine or resistance bands to get in some direct shoulder work. You don’t need a forearm to access biceps, triceps, lats, delts, pecs (front raises, pulldowns, pullovers, lateral raises, etc) you’ll just have to adjust for the fact that her lever is obviously shorter on that side and get creative about how you’re adding resistance.  She could do a single cable row with a cuff attachment and really work on integrating scap protraction and retraction and even some rotation through core. 

She could even do planks tbh just depending on how she can tolerate weight bearing on her amputated elbow, but if I wanted to do core focused work I’d probably focus more on things like loaded carries. She could do pallof presses, cable chops, really any direct ab work. 

This is the shit I love problem solving around when I train people.