Feeling like a failure with my fussy toddler

She refused her homemade lasagne tonight and instead had beans and sausages on toast... it’s a struggle to get her to eat fruit... today she’s had a banana and some strawberries she had turkey dinosaurs for her lunch and veg as she refused to have a toastie or some soup just feel like I’m failing 😩😩😩😩 she’s getting constipated and feeling I’m doing my best she drinks plenty of fruit juice (apple juice) she won’t take prune juice, I’ve been putting a little bit of laxative in her apple juice and encouraging nothing but very diluted juice so pink water throughout the day.... she’s has cereal in the morning which is High in fibre... I’m doing all I can yet it seems like I’m failing