degu barking

Hello everyone, So I have been trying to introduce my degus to one another for some time, All 3 of them being adopted. We have been letting them outside the cages for some time but this is the first time Deagu has been inside the cage with the other 2. Before doing the video linked he mounted...

We have bought 4 female degus and all was great untill today, one of the degus has started to try and mate with all the other's and then she sits and barks for ages. I thought only males barked. Is this right, help.xx