I went through this with my DS when he was little. We have no idea what caused it, from the age of 4 he got worse and worse, he could chew a small spoonful of ice cream and still have difficulty swallowing it.
This was still happening with all food when he was around 8 and mealtimes had become very stressful for everyone at the table and I admit I did shout at him a couple of times in utter frustration.
I finally decided to try not making such an issue about food, he was still growing at a normal height and weight so he was obviously getting enough nutrients somehow.
I can't remember exactly when it stopped, I think it was a gradual thing but it was still happening to a certain degree when he was around 10 (sorry 😟)
He remained cautious about food for a long time and would refuse to try anything new and would decide he didn't like something just by looking at it ... he still ate well but wasn't adventurous in the slightest.
By the time he left for university at 18 he was still not great with some foods, he wouldn't eat fish of any variety, even the thought of fish fingers or fish and chips would horrify him.
He'd been at university around 5 months when we went to visit him and we took him out for lunch, having checked first that they did something he would eat. He ordered calamari and whitebait !!!!! Apparently someone in the flat had some so as a poor student he tried what was being offered.
To this day he doesn't know himself what caused it, but he's now 25 and will eat absolutely anything, he's by far the most adventurous of all of us (we all felt sick when he tried a chicken heart). He's also a wonderful cook, he makes us fresh sushi and comes up with some amazing dishes.
I hope the above hasn't terrified you but you will get through it and find ways to manage her diet, the only bit of advice I can give you is don't let the situation around food become stressful and try and ignore it.



