If you only tried for 10 days then of course she wasn’t telling you when she needed to go. She was still learning. You should have been taking her at regular times, like after each meal or every hour or whatever is appropriate.
What do you mean about having to leave places to get changed? Surely you were carrying a change of clothes and shoes and wipes with you. You just needed to take her into a toilet, put her on the toilet to finish weeing/pooing, help her wipe and then clean any wee off her legs etc, bag up the wet clothes, and into fresh clothes. After that, back to the activity. Did you not take clean clothes with you? Anyway, her getting frustrated about missing an activity is useful. Gives her motivation to learn.
FWIW my DD was 4.5yo when she toilet trained. She has special needs. She has ASD and low muscle tone amongst other issues but most importantly at the time she had clinical anxiety that was crippling. She had to take anti anxiety medication for a few months before she could even deal with sitting on the toilet. She reached her milestones later than her peers but that’s because of her diagnosed disability. We’d tried when she was younger but she couldn’t understand it, and her anxiety left her distressed and crying from any attempt to use the toilet or potty. School wasn’t an issue because I’m in a different country and she had another 6 months before she started school.
Toilet training is possible in winter. It was winter when my DD did it. She was in knickers and tracksuit pants.
Ditch the dummy. Dummy fairy can come and take them away like the tooth fairy does with teeth and DD gets a little present in return for the dummies. She’ll probably cry a lot on the first night, less on the second night, a little bit on the third night and then it’s done. My DD adored her dummy. The first night was hard. Second night was easier.
No more bottle. Her teeth will suffer. Brush teeth, into bed for story time, and she can have a small cup of water to sip instead. Any milk needs to be before teeth brushing. She might miss the comfort of the bottle but she’ll hate getting fillings or extractions a hell of a lot more.
Trust me you’ll love not having to change your DD’s nappy anymore. You’ll love it even more once she can wipe her bum properly after a poo.