I would suggest just being the best Mum to your little one. Be emotionally available, be attentive and be understanding.
My Dad moved 200+ miles away when I was 4. He was (at the time, a good father). I grew up miserable because my Dad was the best parent of the two. I’ve never had a relationship with my Mum, she wasn’t maternal at all and I would be getting myself up ready for school at the age of 6 where she would still be sleeping! Evening meals consisted of pot noodle or cupasoup at times! When I was depressed at the age of 10 onwards I wasn’t given any support at all, I was called melodramatic by her, didn’t even get support when my Mum knew I was self-harming! I absolutely hated my life. When my Dad stayed over when my Mum would go on holiday it was the best time ever, he would be up in the morning, breakfast ready, treats after school, just a present parent, that’s all children need!
However, these days my Dad seems very emotionally immature. I still at times suffer from bouts of depression, I do the best I can for my own family now and I think I’m actually doing well managing everything, however, when I visit my Dad’s there’s these little jibes that annoy me. Say if I’ve been busy at work (working nights) and busy with my Uni assignments, but he’s also busy with work with his and his wife’s cleaning company, there’s these comments like “you don’t know what it’s like to be busy or tired” etc. or like a mocking crying sound if I seem upset or annoyed. I know I shouldn’t react so easily to these things but when it’s a common occurrence it’s just bloody annoying, and it’s like I don’t have any support. If I’m sick for example, like with a bug or something, when I’m better and see him again it’ll be a stupid little comment, but if his wife is sick the look of worry on his face and the sympathy she gets is just totally opposite of how I’m treated, I just don’t get it!
Anyway, I have just realised I’ve gone off on one on someone else’s thread!! But what I’m trying to say is don’t stress about the effect of your daughter not having a father around. Be the best version of you as a mother for your daughter and that’s all she’ll ever need, if she gets all her emotional and mental needs met by you, she might not even question or be interested in who and where her father is and why!
You clearly care about her for wondering and worrying about these things. Everything will be ok :) Best wishes to you.