Just don't forget that she's on the back, it's easily done lol.
If you're going to filter, maybe explain to her what you'll be doing when you get to traffic. I remember being shocked first time we went between 2 lines of traffic, not because of YC's riding, just because I wasn't aware he would, tis a tad unnerving the first couple of times. I was so paranoid he was gonna bash mirrors off and clip my legs lol!
And make sure there's some sort of code going, especially a "stop stop im petrified" tap/shove
Keep checking she's ok if you're riding for a while, maybe even stop and check. She might be too scared of distracting you or just too scared to move while on the go.