Ditto on memorizing sight words. Your child will need to know them, they're full of spelling exceptions anyway, and memorizing them will do worlds for your child's confidence, especially because it will facilitate spelling simple sentences early on. For my son, I used the Dolch sight word lists and went through them grade by grade.
I think it's helpful to present similar words together, another way to build ability and confidence at once. For example when we were covering "-tion", I presented "friction", "suction", etc. together because they were impossible to get wrong, gave speed practice in basic spelling rules, and built confidence. Another thing I used to do was cover all forms of a word together.
I also think it can be helpful to introduce roots early. It doesn't take any special lesson plan, just keeping in mind what words she currently knows, and what words will be in her ability level that share the same root/prefix/suffix. For example, I knew that my son already had "octopus" and "octagon" in his spoken/reading vocabulary, and they were both easy spelling words rules~wise, so those wound up in a spelling miniilesson.
It seems to keep spelling stress low to sprinkle many mini~lessons throughout the day. So, while reading: "Look at that word! It's a great word, and similar to [other word] that we learned last week. I'll give you a moment to look at it carefully, then can you look away and spell it?"
As my son's confidence and ability increased, I began giving him multiple words to spell. One way I did this was after he'd just finished a reading comprehension lesson, while the words were fresh in his head, I'd circle 5-10 interesting words and let him study them all together, then take the sheet away and quiz him, with a prize if he got them all right first try (the bar can of course be lowered depending on perfectionism/frustration level with the activity).
We bought a $5 dry-erase board with marker at a local Rite-Aid pharmacy, which has one white side and one side with writing lines. I used this to write silly sentences, and he would re-write them. Then we'd practice spelling the tougher words without looking. This was one way we worked on spelling and writing at once.
ETA: Sorry for any typos (typing on my phone). Also, I agree with the idea of correcting mistakes, ALWAYS. I don't want my son memorizing incorrect spellings, and taking a gentle correction doesn't have to lead to stress.
