HELP my daughter will not eat she is 26 months and for the last 5 days will not eat.?

she is saying that she has belly ache and is crying cause she is hungry but any food i offer her she will not eat, ive been out and brought food that she has asked for. Winnie the pooh yogs, thomas the tank yogs, noodles, chips, nuggetts, sausages, toast, but any thing i put in front of her she will not eat. she is just crying all the time with belly ache and i dont no what to do next. any help would be great.