Agree, she is probably lactating due to the suckling, which needs to be stopped.
Agree with Karla about having her checked and a good idea to see about getting her spay.
This happened to my neighbors dog. They got a puppy and the older nonspayed female dog took to it like it was her own puppy and developed milk. I think its just nature. sure glad ist only in animals...LOL...... i would get her checked out though just to be safe.
Welcome...This may be nothing more than "False Pregnancy" symptoms...However, in an Un-spayed female of this age, it's possible to be a few other things...Some very serious......Anything from Mammary Gland Infection to Mammary tumors to Cancer needs to be checked out.....All very common in Females over the age of 6 and never Spayed, I'm sorry to say.....
I wouldn't guess with this...She needs to see her Vet just to be on the safe side.....Karla