So it worked! Letting her know that I wouldn't contact her again and would wait for her to contact 'me' actually worked. She phoned me today. Guess she does value the friendship after all, and is just not brilliant at making contact.
If you remember, the last text I sent (about 2 weeks ago,) was 'I won't contact you again now, I will wait for you to contact me as you seem to be quite busy and frazzled just now, so I don't want to add to your stress by badgering you anymore;' and she texted me straight back and said 'sorry for being uselss, I will definately contact you after half term.' And she did, so I am very pleased.
As I said, it looks like she does value the friendship after all...Thanks for your support everyone who replied to my threads from the week before last.
Pixie xxx