Maybe don't let her hide during the day, spend more time socializing her with you guys. Otherwise perhaps she's just biding her time until she feels brave enough, when the house is quiet, to come out and search for her owners. (Her previous ones.)
She's only 7 months, she shouldn't be so strongly bonded to them and should come out into trusting you guys pretty easily given some time and TLC. Cats my family got never had an option about it, with so many kids around they very quickly became bold and assimilated into the family. That included strays or the offspring of dumped cats gone feral, many of them will tame easily if given food and some often forced initial contact. As long as the contact ends well they soon learn not to fear you.
If she is able to be handled, and doesn't overly stress about it, I suggest taking her out of her hiding place a few times a day and holding her, in a nice and soothing way, talking to her, stroking her, etc. Just helping build positive associations rather than letting her run on her predominant program, which may or may not be too timid by nature to seek to initiate a connection. They can get into a habit of hiding without justification for it sometimes and being allowed to avoid contact for too long can reward averse behavior towards it, if all they get from you is food and words, not touch and positive reinforcement.
It is still only 4 days or so, not a big issue right now especially with a 7 month old, but I wouldn't let her stay away for too long if she shows no signs of making an approach towards you or your husband. She's already sounding a bit timid and generally that's pretty easy to change with a little effort towards establishing trust and showing them affection.
Some cats will remain timid for life if nobody takes the time and effort to connect with them, I've tamed adult cats whose own owners couldn't handle them simply because they never took the time to make a connection happen, they just waited for the cat to initiate it. Some cats will never initiate. They often become dangerous with time as they lack trust and reach adulthood with some fundamental opportunities to tame them having been skipped over. Cats revert in a few generations back to their wild state if not kept tame so good to make inroads while she's young.
Many cats are 'eye-shy' and staring directly at them is a hostile threat as far as they understand. Blinking, squinting slightly, looking away, etc can do wonders for helping tame terrified cats, since that's quite simply how they communicate to one another that they do not intend harm. Even feral cats can rapidly build trust for humans who communicate in ways they understand, and that's one of them. It's one of the most important universal body language behaviors you can use to gain trust from pretty much any cat. If they're willing to meet you halfway, that lets them know it's a possibility you're open to.
If she has special treats she loves, you can use that to lure her out of hiding, though when she's eating something that inspires her instincts it may not be the best time to try to pet her or pick her up, obviously.
Best wishes.