Feminizing workout questions

I (cis f) am married to a beautiful woman (MTF) who is wanting to work on feminizing at the gym, but she already has a spectacular rear. Everything I am finding focuses on glutes. She may benefit from some glute medius work but moreso needs a little focus on building the outside of hip/to area and waist/obliques as well as some reshaping/toning/slimming in the bicep and deltoid. Any favorite exercises? She's a relative beginner at the gym but I am not and can help her through form.