Honestly I have two children past this stage, one of them picked up phonics very easily, the other seemed to find it all a total mystery - we think he might be dyslexic like his dad. The advice I got was to go back a stage and concentrate on phonemic awareness. (Waiting to see if this helps!)
Does your DD understand the concept of rhyme, could she pick out which two words rhyme e.g. if told "cat, hat, pig" or if you're reading a rhyming book or song, could she guess at what word comes at the end of the rhyme if you leave a gap for her to fill it in?
And does she know what the first sound in a word is - e.g. if you ask her "Does cat start with ckkh, or mmm?" would she get the right answer most of the time? Can she do it without the two suggestions?
Being able to hear sounds in words and understand rhyme are phonemic awareness which is the step they need to grasp before they can do anything with phonics.
She is only little and the school won't be expecting them all to come in with phonics knowledge at all. They are probably in the stage of figuring out what the children already know.
The main thing to be aware of is to understand letter sounds vs letter names - mmmm rather than "em" for example. And to avoid what you possibly learnt at school yourself if you did Letterland which was to add an extra vowel to letter sounds so M is pronounced "muh" (ah, buh, cuh, duh) - this was changed as it is confusing. Some letters are tricky to pronounce without attaching a vowel at all so just do your best. You can repeat it like "t-t-t-t" - alphablocks is helpful for this (you can watch it yourself if you want to avoid screen time for DD).
Your child's school should have some info about the phonics programme they are following on their website or perhaps in a letter to parents or an info evening, which might not have happened yet at this point in the year. If you don't have this coming up, ask the teacher if they can recommend anything you can look at at home - for example if they tell you the name of the scheme they are following, you might be able to find parent info on the website of the phonics scheme.
I'd also ask the teacher what they want you to do with the letters on the page sent home - if the aim is for her to recognise them, then you could start pointing out when you see them (break them down into groups of 6 or 4 or 3 to focus on at a time if necessary) - the first six letter sounds usually used in British phonics schemes are SATPIN - it means they can make more words rather than going alphabetically, and it leaves more confusing letters for later, like C (which can make the sound /s/ as in circle, or the sound as in cat can be spelled with a k, like in kettle.)
Other things that we have done are games like "If rock started with P it would be pock. If it started with ssss it would be sock. If it started with nnn it would be [k]nock" - to get them thinking about how a word can break down into parts. (-ock is a terrible example - sorry! Too many rude potential words! But you can just nod and quickly pretend it's a nonsense word or talk about cockerels
)
Or I-Spy with the letter sounds e.g. something beginning with sssss. As an adult be careful not to get distracted by the spelling of the word, e.g. cyclist begins with the sound ssss even though it's spelt with c, and things like sh and s are different sounds. This is about hearing the first sound of the word.
If they want to write something then I also encourage them to listen to the sound as I stretch out the word. "How do you spell Mummy?" "Let's listen to the first sound - Mmmmmm -ummy. Mmmmmmm. Mmmmm -ummy." Then when she says "mmm" herself, lots of praise yes, well done, and then you can point to a letter M to remind her how the sound M looks.