This is stupid, if she really gave a shit about then you she would have made time for you. It's far more likely that she's uninterested in going out with you and mildly creeped out. Trying to ask someone out through msn or sms makes you seem obsessive and pathetic, that's a clear sign from the start to her that you have no confidence and if her first impression is that you are unconfident and pathetic then she definitely will try to avoid anything that resembles going out with you. If you had been confident and talked to her in person about everything then you might have had a chance but now it's far more likely that you're a possible emotional tampon for her at best and an irritant at worst.