How do I reduce my dryness over text

This applies generally but here's the specific scenario I'm thinking about right now. There's a girl I know (and no we aren't gonna date so, different connotation). We're like each other's best friends - we talk together daily, make plenty of chances to do stuff irl, all that stuff - but every now and again, like today, I find it really hard to say stuff to her or start an interesting conversation. I'm not a talkative guy and she does a lot of the yapping, but I would love to be able to start interesting conversations from time to time whenever we have a dry day. Any tips? Also, is this weird of me to ask or...?