Ok I am finding it a bit difficult to understand if you rehab baby wild animals how come you can't care for these kittens? I also rehab baby wild animals, skunks, possums, squirrels, bats,raccoons and I also rescue orphaned ferals.
You should have had to take classes, which would equip you to take care of any orphan, regardless of species. If these kittens are bleeding, take them to the vet! If you are not equipped to care for them, find someone in your area that can. These babies are simply looking for their mom. Your neighbor is heartless and she should be reported leaving these kittens to die like this. The suckling instinct in these kittens are just that instinct. They have no way of knowing in their young minds just what they are suckling. They are looking of sustenance and nutrition. So tube feed these babies, or if you have a baby squirrel bottle, use that, the nipple is elongated and able to go further down their throat. Also call an animal rescue group and report what your neighbor is doing to these orphans. While you are making that call tell them about these orphans and ask them to take the babies from you as you are evidently not equipped to handle them. If you are a rehab specialist you should know basic emergency medicine and life-saving techniques for all species.