When she calls or texts you, it should most acceptably be proportionate to your own efforts in contacting her. In any new relationship, it can be exciting and fun to be in frequent contact with one another since you are still getting to know each other. It becomes a problem when missing a call or text leads to multiple missed calls, ill-tempered voicemails, and multiple text messages, within an unreasonably short period of time, demanding to know where you are and why you are not answering, etc. When you do finally get a chance to return her messages, she may become outwardly hostile towards you or accuse you of ignoring or deceiving her. This may be due to an underlying personal insecurity -- perhaps due to past experience with an untrustworthy ex or even instability-- but it is no excuse for this type of obsessive, immature and erratic behaviour, especially if you have done nothing to compromise your trustworthiness.