Preach, I really hate when people just say "hey" or "hi" in DMs with no context when that's all I want out of engagement out of a conversation. I like talking; just get to the point of it straight away please with what you like or want.
PSA: Sending "hey" in DMs is the digital equivalent of making eye contact, and then just... standing there.
It shifts the labour of connection Now they have to ask what you want, why you're there, and whether you're worth their time.
Respect her attention. Speak with a purpose!