I think that Elaine might be avoiding Jo because of possible beef between them after that visit or just that she legit did not want a cup on that day as you never ask her again to go get a coffee or a drink over there nor do you bring up Jo with her. I personally would have been persistent as fuck and be like we gone get some coffee you in yes or no, she says yes and I be like I know a place and we are going there and would not name the place and if we arrive any excuse that get's thrown at me I would be like fuck no I got the place for ourselves let's go and if it continues I would go instant suspect and be like what is with you and this place that you are against it. Bam question shit then and there. But that never happens.
She does avoid it twice, which makes it seem like she IS actively avoiding it more than mere coincidence that she didn't feel like going for a coffee.
First one was in the beach house, after the conversation, MC invite her to hang out a bit more, she agrees, then MC mentions about the coffee place she suddenly says she can't go anymore since it's far and her appointment is on the opposite direction, so MC go for a beach walk instead and suddenly she has all the time in the world.
Then of course we have that bit in the car where it's her who initially invites MC for a coffee and insists him to get one since there's a coffee shop nearby. After MC declines but drives past by Jo's MC brings up the coffee bit and for some reason suddenly she doesn't feel like going for a coffee anymore?
It definitely sounds like she IS actively avoiding either Cup of Jo's or Jolina.
It may be because she sent the email but there could also be more to the story than that. After all, If it's about the email, she has zero idea MC has been snooping and investigating about this, so it makes no sense for Elaine to avoid it, take caution, since a normal person wouldn't think someone was looking through cctvs to find out some obscure activity a long time back.
Despite all this, I still believe Elaine is genuine in terms of her intentions and feelings. Because it makes no sense for her to be the "evil" or manipulative one when there already is the gold digger for that.
At this point I'm just too smitten with Elaine that I hope that she's not manipulating MC or else I would be devastated.