I think she just sees Max as a good friend, she's vulnerable etc, but I can't see a really romantic feeling between them. But Max should definetly come clear with Joy about this, and specially about Esther ex-boyfriend situation.
But yada yada we need drama to move the plot so that's ok
I think their interactions so far have intentionally shown her becoming romantically interested in him. From blushing, being flustered, and saying ambiguous things that clearly point towards developing romantic attraction.
They have really good chemistry, like best friends yeah, but to not notice the bittersweet atmosphere Esther is currently radiating from being conflicted about helping Max but also liking Max herself...
I feel like it's obvious enough that not noticing must be either
really wishful thinking (for a Joy-shipper) or intentionally ignoring it.
The problem about 'coming clean' about Esther's ex situation is that it isn't Max's situation to come clean about. It's a deeply personal thing for Esther and it should only be shared at her discretion.