Modifications:
Cast on 54 (18/18/18. Her sock sizing seems too large)
I prefer size 0 for socks
Decreased 2 after ribbing to 52.
k2p1 rib for 1 1/4”
Change to stockinette
Knit to 2”, start heel stitch on 26 sts
Knit 29 rows, turn heel (purl row)
Pick up 16 for gusset
3 rows after gusset do 16 rows blending b
12 rows b
16 rows blending c

Startoe at 7 1/4”

32 gms color A
8 gms color B
10 gms color C
50 gms total

Measurements
Cuff to bottom of heel 4”
Width 3 1/2”
Foot length 8 1/2”

They fit her perfectly! She loves them and is super happy.