I made my girlfriend angry and wanted to send her a yellow message to make her happy. She's working. I don't know if it's ok. Could she have something to do with this? ...

Look how you made her angry. This is work, and it's easy to be found. Private letters are best sent after work. However, on the whole, this idea is not very good. You can send a funny message, or you can send a message that deeply understands the mistake. The most important thing is to have the sincerity to correct mistakes and to have a gentle tone. It is suggested to send some happy and positive news to bless the landlord.