The mass could actually be fluid around her heart. If it is and the fluid is removed when needed, her life may be prolonged. I went through such a situation with a beloved Quaker. I would consult another vet on this one. Poor sweet little bird.
They can have good days and bad days, just like people.well i don't understand how, but baby is doing better, she still has the tumor, but she is perky and chipper, she is perching, eating and chirping to the other lovebird mable.
she's a little fighter and i guess she's not done with this world yet, woo hoo!