One possible reason could be to gain sympathy. Maybe she wants people to feel sorry for her and pay more attention to her. Another reason might be to cover up her own negligence. If she was supposed to be taking care of the little girl and lost her, lying could be a way to avoid blame.
It's also possible that she has some mental health issues. People with certain mental disorders may fabricate stories without really being aware of the harm it can cause. In this case, her lying about losing the little girl could be a symptom of a larger psychological problem.
She could be lying to protect someone else. Perhaps there was someone else involved in the situation who she doesn't want to get in trouble. For example, if a family member made a mistake that led to the girl being lost, she might lie to keep that person from facing consequences.
Maybe she wants to get attention. Sometimes people lie to make others focus on them.
The first step could be to talk to the people around her. Her friends, neighbors, or other family members might have noticed something strange or have some information that can help. For example, if she said she lost the girl at a particular place, but someone saw her at a different location, that's a clue.
Confront the mom in a gentle way. Let her know that you are concerned about the little girl and that you need to know the truth. Maybe she will break down and tell the real story. But be careful not to be too aggressive as it might make her defensive and less likely to tell the truth.
One reason could be that she was too engaged in the party activities. For example, if she was playing some active party games, her clothes might have come off accidentally. Another reason could be that the clothes were not fastened properly. Maybe the zipper was loose or the buttons were not done up all the way.
One reason could be to avoid unwanted attention from guys she's not interested in. If she doesn't want to deal with someone's advances, saying she has a boyfriend can be an easy way out.
Maybe she wanted to have a laugh. Moms can be a bit mischievous sometimes and dressing her son as a girl could be a fun prank.
Well, in a story, it could be that mom was reminiscing about her own childhood and she had always wanted a daughter. So, she dressed her son as a girl to fulfill that little dream of hers for a short while. It could also be that she was trying to teach me about gender equality in a very unique way, by making me experience what it's like to be a girl for a day. Maybe she also wanted to show off to her friends how adaptable her child was.
The mom could be trying to teach her son about empathy. By having him experience what it's like to be a girl, he can better understand the challenges and experiences of the opposite gender. Additionally, it might be related to the mom's own insecurities or past experiences. For instance, if she had a difficult childhood as a girl and wants to recreate a more positive version of that through her son. Or perhaps she simply wants to show that there are no strict boundaries between genders and that her son can adapt to different identities and appearances.
It could be that the girl has a medical condition. For example, a urinary tract infection that affects her bladder control. Her mom then resorts to pull - ups to help her manage until she gets better. In addition, it might also be that the girl is going through a stressful time, like starting a new school or having family issues, which can sometimes cause regression in toilet training.
Maybe she didn't get what she wanted. Like if she really wanted a particular toy or a certain type of food and her parents said no. It can make her feel disappointed and thus grumpy. Also, if she was bullied by other kids, that would definitely make her grumpy. She would feel sad and angry at the same time, and that would show as grumpiness. In a story, this can create interesting plot developments as she tries to deal with these negative feelings.