Hi @Franny ,
From what you say, I think your daughter sounds really normal - teenagers range massively in terms of their development of romantic relationships, how they decide to express themselves physically, and in how they choose to express their sexuality. It's a time where a lot of teenagers are still working out who they are, who they're attracted to, and what they want from a romantic relationship.
Some teenagers are very demonstrative and affectionate, and some aren't. I think temperament can also play a role, I know from my experience as a parent one of my kids has always been much more physically affectionate than the other 
It sounds like your daughter is moving at a pace that feels comfortable for her, and in a time where teenagers often seem to be pressured to be more sexualised in their appearance and how they act in relationships, I think that's a really admirable thing. It sounds like she has a clear idea of her own boundaries and what feels right for her
This article from Raising Children's Network has some good information based on research about teenagers and relationships, there's a huge variety in what a 'normal' relationship looks like.
Do you worry about her emotional well-being in other ways? You sound like a super caring and concerned mum, and I think it's almost impossible as a parent to stop worrying about our kids.
