Hi Jaynibel .. welcome to the forum and I am very sorry to hear about the loss of your piggy!
I am sure that you will find lots of helpful and friendly advice on here.
If two sows have lived together and one is now on its own, then it will be missing the other one. Guinea pigs like company, which is natural in their habitat.
I would suggest that you contact a local rescue to see if they have a sow that you could try to bond your piggy with, or a neutered male. Sometimes rescues are happy for your piggy to choose its own friend.
If you adopt one from a rescue you will be sure of a healthy pig. If you go to a pet store, then do check that you have a sow and not a boar. Pet stores can mis-sex the guinea pigs that they sell and you can't be sure of the health of the pig, so if you do buy from a pet shop or pet store, please do bear that in mind.
If you don't find one at the local rescue and get one from somewhere else, then try to keep the new piggy housed separately for a while so that you know it is happy and healthy before bonding it with your other piggy.
Let us know how things go.