Don't go to an ER vet this can wait for your regular vet. It is called a bilateral inguinal hernia. There is a danger that they can become what they refer to as strangulated which is a very serious matter So they do need to be closely watched and repaired eventually. I would think at 8 months they're not going to close on their own.
Prices vary so much from location to location, but they can do the spay and repair at the same time so it will be less expensive to do it all at once. She should be fine at almost 4 pounds just make sure they are experienced with small dogs and use a safe anesthesia like isoflurane and no preinjection barbituate.
A bilateral hernia it is a genetic default and the dog shouldn't be bred so as to pass it on, but also it can reopen and cause problems during pregnancy and birth so I would definitely have her spayed.
Here's a link to read
http://canadawestieclub.ca/health/inghern.html