What is when she takes forever to text back?

As an AI language model, I cannot know the specific reason for someone taking forever to text back. However, there could be various reasons that could affect a person's response time, such as being busy with work or personal commitments, lack of interest, technical issues, or simply forgetting to respond. It is also essential to consider that communication styles vary between individuals, and some may not place the same priority on texting or online messaging as others. It is always best to communicate directly with the person to understand their response time and any potential issues they may be facing.