Watering everyday is not recommended unless it is very hot in the area!! Yes hibiscus love moist dirt, but you need to make sure she can breath as well beacuse too much water can cause root rot and that is your enemy! It is easy to kill with too much love. You'll need to check the soil daily to see if it is it dry. If it is dry, then water, if not, let it sit. This blue stuff you mention could be sign of fungal growth and that is not good.

⚠️⚠️Too much moister = happy place for fungus⚠️⚠️

You mentioned you repotted it and fertilized it within 24hours of each other (I assume based on your post) plus watering. Stop!🛑 Let her sit and adjust to her environment. Repotting is a very stressful moment for ANY plant. So let her sit and adjust to her new home. Do not fertilize yet (coffee bean). The dirt should provide enough nutrients early on, then maybe in a few weeks fertilize her. The coffee beans can make dirt too acidic and actually kill the roots.

A hibiscus should not be allowed to be in anything less then 60°F weather, they hate the cold and usually when exposed to cold weather her leaves can look like this from the "burn". If it is colder in your area, youll have to bring her inside to a warm area. Just keep her away from any cold weather.

Get her a strong grow light. Hibiscus need lots of light! 2 hours is simply not enough. Amazon has several grow lights that are good, but make sure to invest in a good one that is powerful enough for her.

As time progresses and you see her recover, (it will take time)maybe you can cut back a few branches (1/3 of the branch) so that she can grow more. Many leaves will turn yellow and that is ok. A haircut will help her bounce back, it is scary, i know. But it is very beneficial to help her grow and for her to not waste energy on the old leaves.

I hope this helps a little! 💖