Hi - is she in Yr2? and what is her reading, and knowledge of phonics like? If she is reading reasonably well and understanding how the sounds and letters 'work' to make words, then I would have thought she would be 'absorbing' many words as she went along.
However, if she is confused by reading and sounds, then I can see it makes it more difficult for her to learn spellings.
As you may have noticed, on MN there are different opinions on the value of weekly 'spelling sheets', and some schools no longer do it. I worked in KS1 for twenty years, mostly as a TA, also as voluntary helper, and have seen a lot of changes in teaching methods. Probably, the Phonics system as currently taught is an improvement on older systems, but unfortunately it is NOT always taught correctly and effectively! Some teachers are brilliant at it, others less so.
Recently I did a reply to another parent with a Yr2 child struggling with learning spellings, and I will copy (and edit) my reply; just ignore any bits that seem irrelevant to your needs:
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?I was a poor speller all through my school life, but ironically, having worked in schools for over twenty years, mostly as a TA but also as a voluntary helper, I now frequently try to help MNers with phonics, Lit, Num and other difficulties or confusions.
What is her reading like, and what sort of words was she spelling at the end of last Term? (before we had that lovely sunny summer holiday - Gosh! doesn't that seem a long time ago! [Rhetorical Question - and she will be learning about those, if she hasn't already!] Also, how is she with other subjects? - maths, history, geog, science etc.
Break the words down in to manageable groups, with as many common threads as possible. If she can bear to do it, write each word clearly and quite large, on cards (or the inside of cereal packet, and cut them out.) Once cut out, she can arrange and re-arrange the words in different ways, finding common links between the words, either phonic links, or other links. For instance, I notice some are places, so group those together.
?Shuffle the word cards around, and find as many SIMILAR things in them, and as many DIFFERENT things as you can, and group them accordingly. In a notebook, write the words down again, in these groupings. (Sorry, but WRITING them helps you remember them.)
Try to think of the words as FRIENDS that you can play with, and not as ENEMIES that you have to fight against! Make lists of 'words within words', so find longer words that contain small words. Then see if you can write sentences, or even a tiny story, using as many of these words as possible. Try to see the phonic 'patterns' and the overall 'look' of a word, so you get to recognise when it just 'looks' right.
Mum: I keep recommending the Oxford Phonics Spelling Dictionary to people to help with improving spelling. It groups words by the initial SOUND, not just the LETTER. So, 'S' is the first section, and after words that DO start with 's', come words that have a 's' sound: circle, circus, cycle, etc. I think the book makes spelling seem much clearer and logical, and thus (hopefully!) easier to learn. You can see sample pages on Amazon HERE:
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I hope the above might be of some use to you.