Yes. It's you being responsible. Sometimes dates getting hotter and funner then anticipated and I have never understood why it always falls to the guy to have a condom ready should it be needed. You will find people who tell you yes, and people who tell you no. I have a Just in Case compact mirror that discretely holds 2 or so condoms depending on the type under a "secret" door.
I think she should absolutely if she's sexually active, planning to be, or out with friends who will be later. That said, it is ABSOLUTELY not on her to be the only one carrying. Her partner, no matter the gender should also be carrying. It's only responsible.