Back her up. Cover her exposed angles and keep an eye on her back while she checks stuff out.

I game with my nieces and nephews and basically just go on bodyguard mode. I've been gaming for decades and they're just kids, so there's absolutely no chance we can work on the same game mode. So I have to make my entertainment in the easier modes by focusing on headshots, or clean kills, or dramatic, whatever, while protecting my niece or nephew and helping them through the game. If you get to a certain compatibility you can up the difficulty and let her rely on you more while growing herself.

But obviously she's not going to get engaged in the game if she's just following and watching you kill everything. So ask yourself how much you want to game with her, then apply that desire.