TinkerTills:
Please don't worry. Your daughter will not be expected to know this all on day one. The point of school is to go there to learn - really!
The phonics system the school prefers will be taught there - through explanation by teacher, songs & movements and probably a myriad of other activities to teach them the various phonemes (sounds letters make) and then blended sounds.
Usually fairly shortly after starting the teacher will send home information about teaching phonics and learning to read. This will explain how it will be taught and what system(s) is(are) followed. As you've probably already worked out there are several competing approaches and jolly phonics/ oxford owl/ alphablocks/ etc... are not completely identical.
One thing to bear in mind is that at this age children are amazingly resilient and have fantastic ability to process speach and learn how to communicate. (That's why many feel it's easiest to learn another language whilst your young).
My advice is relax but keep an eye out for this information or ask about it at your first parent/ teacher meeting. If they're using jolly phonics, as Nagoo suggested the workbooks are brilliant - they're more like colouring books but there's lots of writing/ sounding out practice. Jolly phonics also has actions/ little songs to help remember the sounds.
I slightly missed the boat with DD1 (they were just rolling this out at our school and communication was not great) - but with DD2 the teacher had sounds of the week and high frequency words for the children to learn (many with actions - like bringing your knee up and with arms bent drawing both elbows down swiftly toward your knee for 'YES'). DD2 took to these action words like a fish to water and indeed her reading ability was leaps and bounds ahead of her sister at that age. (info on action words here www.actionwords.co.uk & example of movements for words here: www.actionwords.co.uk/RBsample-4.htm.
For the moment the more you read to your DD and talk with her, the better and don't worry about the rest or what she's learning or not learning this summer before school starts - it will sort itself out and, just to let you in on a secret, there's no one magic way to do this and everyone learns differently.
HTH