Girl's Behavior

She's ignoring me, how long should I wait before I go to her house and confront her face to face?

I'm 20 and she's 22. we've been talking and hanging out regularly for the past 9 weeks and we've become rather close. We're both really open with each other, especially about our feeling for each other. We do everything like we would be in a relationship but we just don't have the title of one cause we're taking things slow. In the past week she's been rather distant has left me hanging high and dry with lack of contact, I've tried to make plans to hang out 3 or 4 times, I'll ask her if she's doing anything or if she has any plans and she'll tell me something like "I don't know I think I might be doing something with my mom, want me to call you when I figure it out?" or she'll be out swimming and I'll ask if she like to hang out when she's done swimming and she'll say "yeah, want me to call you when I'm done?" and my response's are "yeah I'd love that" and she doesn't call me back. And know its at the point where she doesn't reply to any of my calls or texts. I've become rather worried about her lately because this isn't like her by any means. A couple days ago I wrote her a letter displaying my concerns for her health and how I wish she would reply to my messages. (I'm concerned for her health because 2 weeks ago she told me she could tell that she's starting to get depressed because she been spending a lot of time just laying in bed instead of being socially active.) I left the letter with her father and asked him to be sure that she gets in when she returns and he said he would make sure she got it. As was driving home(it's a 45 min. Drive) she called me when I was about 10 min from my house and I had trouble getting the phone out of my pocket, by the time I answered it had gone to voicemail. I tried calling back but she just picked up and hung up on me without a word. We had made plans to go to a slightly stoopid, cypress hill and collie buddz concert a couple weeks ago and I bought the tickets for the show and picked up a copy of the pitch(she likes the pitch because of all the concert listings in it) yesterday, I tried calling her once more and again no answer so I decided I would go by her house since I was already in the area and leave the tickets and the pitch in her mail box and sent a text as follows "idk what's going on in your life but whatever it is I hope it works out for the best. I left you the tickets and a copy of the pitch in your mail box what you do with them is entirely up to you. I'm taking your silence as a sign that you don't want me around, I won't bother you anymore." now I feel although I have made a mistake by doing what I did and I want to speak with her face to face to figure out what's going on cause her silence is killing me and I'm really worried about her. I know she has feelings for me and I think she's scared that I might break her heart and that's why she's avoiding me. Any ideas on what I should do or how long I should wait before going to her house to try and talk face to face? Thanks for your time and your help in advance
Updates
+1 y
so it's been two weeks since I've had any real contact with her and I'm really at a loss of ideas of what to do. this girl means the world to me and I can't allow myself to lose her as a friend. any ideas?
Updates
+1 y
i wanna thank every single one of you who has shared your input on the discussion! I would also like you all to know that she finally contacted me a couple days ago and we've worked everything out :)
She's ignoring me, how long should I wait before I go to her house and confront her face to face?
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