Why "hey" gives you little to work with
A single-word opener gives the other person no clue what interested you. Reference one specific detail and ask a light, easy-to-answer question instead.
The hook-and-question formula
Reference one specific thing from her profile + ask one specific, easy-to-answer question. That's it. Don't compliment her looks. Don't open with a generic question like "how was your day."
Examples:
Each is specific, low-friction, and gives her something to actually respond to.
What to avoid
Use a chat reply assistant for momentum
Once she replies, the next three messages decide whether you get the date. A chat reply assistant like the Lion's Forge Conversation Helper gives you instant, on-tone reply suggestions in any voice — playful, bold, calculated. Never fumble a reply again.
