As background, I'm shy and introverted and only have a couple of close friends but I'm happy. I hate using the phone as a phone, I will merrily text all day but I'm not a chit chat person. If I have to make a call my heart rate rockets and I fear I am disturbing and inconveniencing the person I'm calling 
. If my phone rings I usually ignore it unless it's dh (he only actually rings if it's really important) or school or childcare. I assume people will leave a message if they need to.
Dd made friends with a girl at school. They've had a few play dates (which I just about cope with!). The trouble is her mother - who rings rather than texts me. I ignore and follow up with 'sorry I missed your call, text back if you need me' type of message. She rarely texts though and will call again. Still I ignore and repeat the text. I recieved two missed calls on Monday. Yesterday at school she said 'You never answer your phone!' and seemed a bit annoyed. I asked why she called and she said it was to ask about food for the play date this week. I repeated 'sorry I was busy, it's usually better to text me' and she just laughed as if I was joking 
I am feeling the need to back off from this woman. What is wrong with preferring to communicate via text?