Banadoura, isn't it amazing how fast that the plants can recover? They are looking so much better now. I am so glad to see that it helped them.
It looks as if you might have a little mold growing on the surface of the dwarf pot. It may or may not have contributed to the plants demise, depending on what type it is. To avoid mold growth you can use a fan on the plants or add a little hydrogen peroxide and water to a spray bottle and mist the surface of the soil. Using a small layer of sand on the soil surface also helps prevent mold from growing. For me I find that ventilation is free and quite easy to provide.
You are doing a great job with your first plants from seed. They should do well once planted out and I am thinking that your daughter will be glad to have her room back...