HELP!!! 🏳️‍🌈❣️(i’m sorry it’s long but please )

About two weeks ago me and this girl who i’m friends with start talking a lot more. She goes to a different school than me so we only saw each other in person about two times. i knew she was bisexual so about a few days ago i admit that i’ve liked her for a really long time. long story short she says she has the same feelings and said that we should hang out sometime. last night i invite her over for a friendly sleepover. we both address the fact that it’s not just for sex or anything. we agreed that if something naturally happened between us then something happens and so be it. we watch all of The End of the F***ing World as we gossiped about the girls we knew. Eventually we went upstairs to my room where we were laying on my bed listening to various Sam Smith songs. we were both bored out of our minds. out of nowhere she says “i know something we could do but”. i knew she was referencing that she wanted to do “stuff”. i did too so i just turned really quickly and we started making out. we pulled away and we both wanted sleep so we get in our pjs and we are laying in my bed with a foot between us. she said she wanted to cuddle so we did which lead to two more makeout sessions. i ended up falling asleep in her arms. when morning came and she had to go home i laid one on her. when she got home i asked her if she was okay and she said she needed time to “process and thing about last night”. she wrote me a paragraph about how she enjoyed every single moment we had together.

what does she mean by “thinking and processing”? i really like her and i’m terrified of losing her.