How do I ask this

there’s this girl I’m really infatuated with her, but more than that, I genuinely feel like I want something serious and meaningful with her. The important thing is we both want to keep things halal.

Here’s where I’m stuck. I know she sees my messages, but I haven’t properly expressed how I feel. She’s the type of person who doesn’t tolerate any games or indirect behavior, so if I approach this in a vague or casual way, I feel like it’ll backfire.

At the same time, being very direct about something like this feels intense. Part of me is wondering if I should just be upfront and say I’m interested in her for marriage and even ask for her father’s number, but I don’t know if that’s too much too fast.

I don’t want to mess this up by either being too passive or coming on too strong. For those who’ve been in similar situations or understand how to approach this in a halal way, what would you recommend? How should I go about expressing my intentions respectfully and appropriately?