I've been out all day so am just catching up with the replies. I'm quite touched that so many people thought to bother and it's given me a good laugh!
I shall take the very good advice to turn the conversation back to her life and not mine. Also the the wonderful excuses might come in handy. Especially the one about having nits!
Its hard to explain how she always manages to hit a tender spot but I'll go in a positive frame of mind thanks to you lot! 
Water shortages and hosepipe bans
Rupert Lowe and the “rowers” haha
Reducing contact because my heart just isn't in it.
Go have a nice cup of cha & start making a list of glamorous or vile excuses, or new names for Bunbury!