In the first screenshot The layer is selected but not the hair. On that layer do CTRL + Click on the layer thumbnail to select the hair. Then you can do edits.
On the 2nd screenshot, it is in Transform Mode and that will deny edits. With Transform selected, you can only apply a Transform to the object.
Hmm that what you write works but this is not the way I want to solve it.
Bacause I don't know that is happening. Sometimes I can edit/copy/cut everything and sometimes (this example) I don't have that options. What is going on?