Please help save my plant 😭

I got this Northern Lights calathea about 5 days ago and she was super big and strong! However, yesterday I noticed that her soil was getting dry and the leaves were curling, so I put her on my priority watering list for the next day. Fast forward to today and BAM – her leaves are super curled and she’s extremely droopy 😔 I should’ve watered her the moment I noticed the dry soil, but she was honestly doing so well before deteriorating in a snap.

So my question to you all is: is it possible to resurrect her? What do I need to do over the next few days/weeks to help her recover?

I’ve never had a plant that thrives in humidity before so I’m not sure how to go about providing that. I moved her to the bathroom today but it’s such a small space with minimal lighting. I could buy a humidifier, but since she’s my only humidity-loving plant, is there another way? Also, how much light does she actually need? I was told intense indirect light, so I had her hanging out with my other plants under lights for about 10hrs a day. Is that too much? Am I torturing her??

Please send all your advice – I don’t want to give up on her 🥺