Hi Matt,
Sorry to meet you here. It's hard when someone gets a dx of a rare cell type because there aren't enough studies that have been done to find the right treatment. In the case of sarcoma bladder cancer and most other rare types, surgery is considered the best bet and the long term survival is dependent on the stage of the cancer.
I'm sure the doctor did not do anything wrong by only removing 6 lymph nodes, in any case only half were involved, but even one involved node stages a person at IV. It's still common to find that people with lymph node involvement get chemo first instead of surgery first, but that is not the approach used with bladder sarcoma.
Nausea 9 days post-op is not unusual, there are many medications these days, so if the one she is taking doesn't help, ask about an alternative. Have her "bowels woken up" yet? Is she still in the hospital?
Wishing you well,
Wendy