Singapore Maths (SG Maths) is a good curriculum, IMO.
The books a relatively low cost and easily available for purchase online.
There are also SG Challenge question books.
When you encounter a brick wall, try to find a route that bypasses it.
What we did with our DD was to do the SG Maths through their 5 grade and then we switched to AoPS for the pre-algebra onwards. This left her classroom Maths far behind.
I would recommend that you just use the online tests to see where your DD is for SG Maths and then just get the books. We got the textbooks and the exercise books (I was super worried about gaps so made her do the practice in the exercise books) but not the teacher guides because they were not needed.
