The 'Live Laugh Love' thing isn't really the sort of thing someone with discerning taste would have in their bedroom, but it is something an average middle-aged woman would have, which really does make me think the bedroom could belong to Lena's parents (specifically her mum's decision, with her dad just going along with it). The hanging lights do seem a bit weird for a parent's bedroom though (more for a younger girl), I agree on that.
Alternatively it could be Cindy's bedroom because Wade doesn't seem to care enough to have a say in how they decorate their bedroom, and Cindy takes control of those kinds of decisions in the absence of him doing it. Cindy is easy-going and sweet enough that I can see her thinking 'live laugh love' is a 'cute' sentiment.
I agree that not having a second nightstand seems weird for a couple's bedroom, but it's not a complete deal-breaker, and may have even been a design oversight. Ehh... IDK. This is a pretty tough one.