I’ll give some ideas, but this is a college forum. Perhaps there is an online forum for dwarfism? You might get better suggestions there.
Are there any organizations that deal with your daughter’s issues? Have you spoken to your pedicatrician about this?
Perhaps an occupational therapist might have some adaptive ideas for the door knobs. And seating.
Can she sit on the chairs or couch with her legs crossed? Or with a foot rest? Our kids were both very small, and sat on the regular couch as toddlers but with crossed legs. That was fine with us. We also had pillows on the couch if needed.