Rita (you may know this, but I put it here for newbies), the neosporin is fine for a first aid application, but you can't keep putting it on every day. If you do, the flesh will not be able to granulate. Granulation is promoted by gentle washing with saline as you have indicated, but then tamping it dry with sterile gauze and letting air get to it (aids in the regeneration). that's one of the reasons several vets we have used for the (dozens) of mating wounds here advocate the use of honey after the first aid is over. In fact you can use honey in the beginning as a safe alternative. A teenie weenie dab of honey will melt and disperse easier than neosporin so the granulation can occur. This, of course is the procedure for an "open" wound such as a small dime-sized mating wound, that does not need stitches.
In extreme cases, a wet/dry bandage treatment can be used on an open wound where the wet bandage acts as a mesh on top of the wound to promote granulation. The dry on top just keeps debris out.
of course, when you get to the vet you will probably get an antibiotic and that will chase infection.
Please prepare yourself for possible disappointment regarding re-joining your little girl to her family:
1. No, don't try again to put her back in a few days. All evidence of the wound must be COMPLETELY gone before putting her back. When I say completely I mean it. Even if the wound heals-over but there is a little pinkish spot and a lack of fur - her family will "overgroom" that INSTANTLY and put her right back to square one. So don't put her back until you can't even tell something was wrong. Gliders pick at ANYTHING on their own bodies or others' that is even slightly abnormal.
If you put her back in a few days I guarantee they are going to go right for that spot again. And each time they go for that spot, it's like they are "imprinting" themselves each time to keep going after it. So you need to keep them separate for like a month and a half.
2. Give them ONE more chance after she is completely healed. If it happens ONE more time, our recommendation is that you never put her back with them. If it happens one more time, that means they are going to keep doing it. You may be forced to keep her alone or find another cage mate for her.
I am so sorry to have to tell you this. We unfortunately have a lot of experience with this problem. If you want to call to talk about it just let me know. there are some other tips that may be useful. We will pray for a full recovery for Tosca.