It wouldn't hurt for Lady Melissa to do a little bit of kindness right? She had sold most of them anyway, and she wanted to see their delighted faces seeing the dress, which was of course custom made.
Lady Melissa had also donated some jewellery- of course, she made sure not to donate any family heirlooms or such, but she knew how important a debute was, especially to society.
A woman's debute to society wasn't something to belittle, and Lady Melissa had found out about it in her second life, it was more than it led on, and it was when society would finally deem a girl, a young woman.
Lady Melissa wanted the girls to be able to have a debut ball if that was possible, and some nice jewellery and clothes for them to wear, she didn't want them to be looked down on by others just because of their appearance.