You should be able to do this. When we brought Teddy home, he was 8 months old and 100% outdoor trained. We needed him to be pad trained like his brother.
The only problem you might encounter is confusion with the other dogs. What breed/how big are they?
Contain her to a smallish area -- one room or an xpen -- with the pad. I use disposable pads that are infused with a scent to attract the dogs. Put her on the pad several times a day and establish keywords like "go potty" or "go potty on the pad." She probably won't go on command, but she will learn the words and make the connection. Supervise her and if she uses the pad, give her tons of praise and a small treat (I use kibble rewards). Say "Good potty on the pad!"
If she does well with the pad, you can increase her roaming room and freedom.
For Teddy, peeing on the pad was no problem, but he did not want to poop indoors. I had to contain him to the pen lined with pads and encourage him to do it. When he finally did it and saw how happy I was, he was okay with it. Disposing of it right away is very important to him.
Here is my blog post about the subject:
Potty Training Small Dogs - Dog Life and Style