Oh good, you're becoming a
cavy slave already! I am sure she appreciates all that you are doing for her. I don't know if you have started weighing her weekly yet but I found my digital scale on Amazon
it was like this one and I love it
Amazon.com: American Weigh Digital Bowl Kitchen Scale 2 Kg / 4.4 Lb Back or White: Home & Garden
Guinealynx has printable weight charts which are really great for tracking their weight. It definitly gives me a peace of mind when I weigh all 5 pigs every week and can see that everyone is normal.
Have you looked on petfinder for pigs in your area?