Can somebody help me please? My 18m old daughte...

Can somebody help me please? My 18m old daughter has started playing up while eating. Most days I will put a spoonful of food in her mouth and it will take about 5 minutes for her to finish that spoonful. She sits with it in her mouth, then after a while she will swallow her food. This has been going on for a few weeks now and it isn't food that she hasn't had before. Also, I am getting a little stuck on ideas of food for her. She is slowly starting to eat what we do for dinner, but I'm getting stuck on ideas for lunch. Dinner is her main meal. Thank you. Eva, daughter Alanna 18 months old.