Could you answer a few simple questions, it may be that you have in previous posts, but could you just clarify on this post too.

How old is the bitch in whelp?
Is the 13 month a daughter of the in whelp bitch?
Is the in whelp bitch larger, stockier than the 13 monther, or are they evenly matched?
Are the characters similar?
The Alpha bitch generally has those of a lesser pecking order licking her mouth to show submission to her, it is confusing that the 'Alpha' also is licking the 13 monther who is a young lady now, this to me is saying that they are on an even status, which is strange as the 'older' bitch should be the more Alpha and may well have a little tussle with an adolescent yougster pushing her luck. The 13 monther is obviously justling for a higher status, but the signals from the 'Alpha' are wrong?
Due to her also licking the youngsters mouth, it look as though they will need to fight this out for top bitch with the signals being given.
Hopefully the in whelp bitch is a little larger? If so make her status higher by doing everything first with her. Grooming, feeding, fussing. Due to her condition I would not allow any pecking order fights or allow them to try and sort this out, seperate if problems happen and especially when you are not in the room. Don't allow the in whelp bitch to become stressed, it is the wrong time for her to have to defend her status.
After the pups etc, she should have her Alpha status automatically, but if the 13 monther is still wishing to take her on, and they can not sort out status themselves, then you may well need to seperate or even re-home.
Just make the in whelp bitch the Alpha yourself for now, and I hope that things will settle. Generally with a good age gap they do.