Hand Holding :
take it a day at a time. See how the lump progresses.
2 is young - if your GP was old, then I'd be inclined to say "don't".
Does your vet do a fair bit of small animal surgery?
How long would the recovery be?
Do they recommend removing it whether its a mammary tumour or a lymph node. You need to weigh up - will it get bigger and cause her trouble with it's size and location if it's non malignent?
I know from a previous thread that fortified had one of her sows operated on (IIRC she had a more internal problem, your pig sound like it's a palpable lump, so more superficial)
Would you be able to wait till after your break before you put her in for surgery?
WRT your job, I suppose it depends on what happens with piggie. Even if she has surgery done , you'll still be there part of the time, you might need to seperate her from her cagemate (side-by-side them maybe) while she recovers, he won't be able to sleep in hay. You can give it in a rack though, give her blanket or towel for bedding.
(Our older boy has got a lump in his chins, it's common with older pigs but doesn't get in his way. I don't think I'd put him through an operation though, he's nearly 4 and a bit doddery now ) 