When she hits we are saying, that’s not nice mummy is hurt now, she then pulls a sad face like she’s about to cry, I ask her to say sorry (she always does) then hugs me. But will do it again 10mins later..
This is effective to teach her that it is expected that she should say sorry after she hits, but it's not effective to teach her that you don't like hitting. At two their ability to learn through verbal instruction is extremely limited, so saying "that's not nice, Mummy is hurt" is not something that she can use or understand. She will say sorry, because she is mimicking you, but mimicking at two does not mean that they understand the meaning of what they are saying.
In fact, this approach is likely to encourage hitting because it gets a verbal response from you and that's something they're basically programmed to seek out and repeat anything which gets it.
If you want to discourage her from hitting, then you can either interrupt the hitting (e.g. block it with your hands or hold her arms), optionally use a verbal cue that you use when she is not allowed something, like "ah-ah" and offer an alternative/replacement behaviour, perhaps with a word for her feelings e.g. "I see you are angry, when you feel angry, you can [stomp your feet], but I won't let you hit." You will have to show her the replacement behaviour, and make sure you give her lots of praise/attention when she does this and keep trying to intercept the hitting. If she does hit then ignore it, rather than trying to talk about it.
Or you can use a mild aversive like a stern/loud "NO!", or withdrawing attention for a few moments, or a time out.
You can do both at once if you like, that is the quickest way.
If you are very against using aversives, then you need to be really patient and consistent with the positive only method, and try really hard to spot (and avoid) if you're accidentally giving attention to hitting by trying to talk nicely about how much you don't like it. Essentially the toddler brain is like a dog - you would not expect to be able to explain to a dog why they should not do something, you teach them an incompatible behaviour, or you have a clear signal that they don't like.