i think the main mistake you made was saying
"candice come upstairs
bc i want to talk to you"
You lost the fun/flirty vibe and in her mind it would of been getting too serious, because she knew why you waned her to come upstairs, and we do aswell
You gotta keep it fun,
"hey candice, come up, ill show you them crazy videos i was talking about earlier"
"hey candice, come up, i wanna show you my pet crocodile"
the first one you have to plant the idea about the videos early in the interaction, so say that you watched some amazing videos earlier, and thet she should definately see them.
For the 2nd one,
only do this if you know the K close is on, because you can take her up, and shell be like "so wheres the crocodile then" and you just say there isnt one and kiss her