I am sooooo lucky with Remy because Bailey (my shih tuz) loves loves loves to play with her and is so good with her. I call him my babysitter. I have said to dh many times, if Remy was my first dog and I did not have other dogs she would drive me nuts. But that is Bailey's personality and I was really lucky. (Sam on the other had just growls at her).
I am also lucky because my dh (who said he does not like dog and did not want one ha ha) loves to play with her. He throw the toys and gets down and plays with her... it is funny to see the three of them

And.... we take all the pack out for walks.. long walks about 30 to 45 mins. each. It is good for me and for them.
Also, I have been trying to teach her tricks.. she loves the interaction.
And... we have routine. Sadly she does not know the difference between work week and the week end UGH!
so... mental stitumlation... exercise.. routine and disipline (just like you would a child)
good luck and I know it will be ok-- you are a good yorkie mom