Picky eater all of sudden

Anyone elses toddler become a fussy eater out of no where?

My LO use to eat everything and anything. She use to eat quite well for her age however now she doesnt eat as much. Dont get me wrong she loves fruits and veggies but sometimes i struggle to get food into her. She will play with it and throw it. She has also started to gag at some foods she use to eat happily and would

Much rather breast milk than food.

That gets me to my next point... she has started nursing like a newborn day and night. She tells me she wants milk and taps my chest constantly.... I MEAN CONSTANTLY!! Even 10 mins after a feed. She will feed all through the night if i let her and if i dont she refuses to sleep and will cry and scream.

Any other mums dealing with this? If so what has helped get your toddler to eat more. Any food ideas? Any way to only get her to nurse when she really needs.

Another question, could her appetite be affected because she nurses all night?

Thanks in advance :)