Was she showing an interest in learning to read? As a Reception teacher, I would always advise parents to hold back until they start school, unless a child is genuinely interested. When they are, it usually clicks quite early. If they're not, it can be a bit of a slog.
It's not unusual for children to take a while to become competent with blending, even once they've started school. It is far too soon to be rushing her on to 4 sounds if she hasn't grasped blending 3 yet, so hold fire with that and return to CVC for now (if she actually wants to engage with it). If she has lost interest don't push it and leave it until she starts school.
Oral blending comes first. Is she able to hear words when you sound out instructions to her? (Eg go and find your h-a-t, put it in the b-i-n, sit on the m-a-t).
I would go back to basics if she is still interested. Leave reading words for now and play lots of oral blending games instead. You can play a cvc version of I-Spy (you sound out the object and see if she can point to it, eg I-spy with my little eye a d-o-g, a t-a-p, a b-e-d etc). Another game we play a lot is Simon says, sounding out body parts (stamp your f-oo-t, touch your b-a-ck, point to your ch-i-n, shake your h-ea-d etc). Or have fun making animal noises (eg what noise does a p-i-g make? What about a c-a-t?). What's in the bag? (Have a selection of random CVC items from around the house and sound them out for her to identify, eg in the bag is a c-u-p).
Have fun with it. She will get there in her own time and, when she can confidently hear oral blends, she'll generally be a lot more successful blending words in their written form. Jumping straight in to asking her to blend learnt graphemes (letter sounds in written form) in order to identify the word is missing out a huge step in her development.