Try giving some water every 3rd mouthful, see if that helps the swallowing. At this stage she gets complete nutrition from her milk so no worries if it doesn't go in. Things change very fast in a month or so. You're doing great at just offering up different things. Smile lots and give encouragement.
Things like peas, sweetcorn, rice crispies, bit of breadstick, are good to put on the tray for her to play with. Some might go in, no worries if they don't.
Just keep experimenting and don't worry too much about any type of result quite yet, keep the high chair sessions short and interesting for her. She might have fun playing with utensils too.
Also try to let her watch you eat something at the same time, then she will learn by watching what you do. Even better if what you eating is the same as what she is eating, so with yoghurt do like one spoon for you, one spoon for her.
Feel free to PM me xx, happy Christmas x