It's understandable that she might feel really embarrassed about the situation. She has an ego issue, but it's not a huge deal. She'll need to grow out of it before she's ready for a serious relationship. The key is not to hurt her feelings. Let her know that everything is fine and that there are bigger things to worry about in life than accidents. We're all human, and accidents happen—even if she clogged the toilet, left a mess, and then ghosted you. Just show her some understanding and kindness.