Amy takes a mental equivalent of a deep breath "Ok, well, I wanted to play around with this, with your magic and my form, so here goes...Genie, I wish to think like a bikini for one hour" and Genie gestures and simply giggles, for the next hour she is in essence free, her mistress may exist, but has no ability to make a wish or command, indeed, doesn't even know she exists. But she lays on the sand, after using magic to create a nice beach towel, and enjoys the warm sun in her new bikini.
The process is so smooth, so instantaneous that Amy doesn't even realize she stops existing, well, at least as an awareness. No memory, no intelligence, she simply becomes an object, and while it is aware, with no memory whatsoever, it can't recall it is aware. It's existence is simply immediate and sensation, with not the least bit of ability to think about its condition, only to feel.
The hour passes rather luxuriously for Genie, never having had this while out of her bottle before. The same hour passes rather differently for her bikini. With no concept of time, nor any memory, the swimsuit can't tell the difference between an hour and a year, between a second and a century.
Genie had taken a brief swim in the warm waters and is now laying on the towel once more, when Amy's mind resumes existing. Genie giggles as she hears her mentally "Ok, so, when are you going to make me think like a bik...wait, hold on" and while Amy was a bikini with no memory at all, Amy's mind is able to piece together its existence during that time, and while she was initially disoriented not realizing what had happened, she should have pieced it all together right about...
"HOLY SHIT! Oh my God, I was a bikini, like all the way, had no memory of who I was, of anything, and it was a whole hour and I had no freakin clue! Genie!" Genie gets up, and adjusts her mistress the bikini "Yes mistress, rather intensely relaxing wasn't it?" Amy blinks, well, no of course not really, but then realizes "Oh my God, yeah, it was incredible, so simple just existing, fulfilling my purpose as a swimsuit, but it was so intoxicating. I understand how if I didn't tell you a time to restore me, I would just be...gone" But then Amy realizes something else "You...you were in essence free while I was like that, weren't you?"
Genie nods "First time in millennia, well, actually, since I had been a human slave, first time ever... not counting inside my bottle, but yes. I suppose I should thank you. It was almost like a little break from being a genie"
Amy the bikini considers: