In an extended sneak peek from tomorrow's episode, we see Candis' question in context and she wasn't actually asking Caitlyn out, she was asking Caitlyn what she would say if someone asked her out, because Caitlyn had just mentioned that she wasn't sure what she would do in that situation and Candis was helping her prepare.
"Would you like to go out on a date?" Candis asks Cait, after she says she's not sure what she would do if she was approached. "Like if somebody walked up to you who was beautiful and I was like, 'Would you like to go out on a date sometime?' What would you say?" Candis clarifies.
Could her inquiry have been for herself? Of course, but that is yet to be seen. All we know is that they seem really happy when they're hanging out and if their friendship turns into something more, that would be icing on the cake.