PTS on Friday seems harsh if she still has a good quality of life and you don't know what the lump is. I would want more information on what exactly the 'lump' is. Abscesses can be treated by surgical removal and injectable antibiotics. Cancer is obviously more serious, and it depends on the spread as to whether amputation is a realistic option.
Seeking a second opinion from a specialist is a good idea, and should give you some answers / options. I would expect at least x-rays (or a more expensive CT scan) to see if there is bone degredation from the lump, and maybe a fine needle aspiration if a cyst or abscess is suspected. You also need to know if there are any secondary sites of spread, eg lungs.
Tripod bunnies do quite well, if amputation is an option. Her age shouldn't be a risk factor for anaesthetic, if there are no other health issues. I've had 9 year old dental rabbits undergo regular GAs.
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