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Your daughter would usually be correct, but since you want to lose weight, you could get away with. You could also work on vacuums, where you suck your stomach in and force your air out, which bodybuilders used to do to help control the size of their waists. Again, if you're cleared to do these exercises, lying leg raises and bicycle ab crunches are good starting points.
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The stomach hanging is going to require more with your nutrition than your training, and even then your hysterectomy will still make it a challenge.
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Single leg press, single leg extension, and lying single leg curls are all good starts. If you're cleared to train by your doc, then spend a few weeks focusing only on the left leg with light weights and focus on slow, controlled reps. Keep in mind that anything your doctor says would override what I have to suggest because your physician clearly knows you more than me.
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