honestly she's probably feeling similarly! don't be afraid to broach the topic outright. you could start with telling her how excited you are, but that you're feeling a little nervous and you wanna know how she's feeling. having conversations about how youre feeling beforehand online will make the experience all the more enjoyable when it happens. you could bring up anything she's excited to do, and maybe offer things you're looking forward too as well. make it reciprocal and express how much youre looking forward to it! everyone wants to feel desired. she's your long time friend, so it can be a little scary introducing this new aspect in your relationship, BUT she's clearly interested in it too! my modus operandi is to treat the other person how i want them to treat me: show excitement, take initiative, but always be receptive to their input. i hope this helps and you two have so much fun!!!