My DS is 18 momths and hardly eats with a spoon or fork either - it's fingers all the way, for everything, even yoghurt and custard!!!
I think that the food they eat is far more important than how they get it into their mouths, at this stage, so I really wouldn't worry about the spoon thing right now.
I always offer DS a fork / spoon though, sometimes he picks up and uses it for a bit, sometimes he doesn't, esp. if he's really hungry, he just rams fistfuls of food in his mouth!!!
Eating with her will let her see what cutlery is for though, so it's worth trying to do this - and as for trying new foods, I find DS is much more open minded about trying new things when we're out and about.
We've just returned from Lanzarote and took him out to dinner most evenings. He tried all sorts of things I'm sure he wouldn't have touched at home, and adored all the attention from other diners and waiters - they all thought he was hilarious as he ended up covered in food from head to toe!
Tell your mum the odd white lie if it makes you feel better, but let your little girl enjoy her food, her way