The pattern I used us adapted from a 1953 sweater. I took a lot of liberty with it, but the general style is the same. It should fit a size small. Finished measurements for the front and back panels are about 14 inches across.

Yarn colors I used (all are loops and threads impeccable brand yarn unless otherwise stated):
Base: Sapphire (2-3 skeins)
Stripes in this order (only a yard or so each):
Forest
Barley
Fern
Lion Brand Pound of Love Hunter
Misty Blue
Navy
Cherry
Pumpkin
Red Heart Butter
Yarn Bee Tobacco
Gold

The only color I’m not super happy with is the Red Heart Butter. That stripe is supposed to be more of a peach or apricot, but I don’t have either of those, so I settled for a warm yellow. When I lined up the colors, I was happy with the look, so I’m going to stick with it.

Really, the colors you need (raid your stash for what you can) are: medium-light green
light brownish green
light green
dark green
light-medium blue
dark blue
red
orange
light orangy-peach
dark gold or bronze
gold.
If you have anything like this, you should be good. You can also look up the t-shirt online and raid your stash for the colors you think are best.

Materials:
All yarn colors listed above, or colors you think match the stripes better (or another color for the base since she has a few different options). All yarns must be medium weight, regardless of choice.
Size 4 (3.5mm) and 7 (5mm) needles
Stitch Markers

FRONT:
In base color CO 76 stitches on smaller needles (size 4).
K1P1 in single rib stitch for 3 inches.
Knit the entire next row onto the larger needles (size 7). Do not K1P1 on this row.
Work in stockinette for 9 inches.
Begin the stripes by making two rows in each color in the above order.
Piece should measure about 12.25inches after stripes.
Transition back to main color and work until piece measures 18inches ending on a purl row.
K22st, bind off 32st, K22st.
Working each shoulder separately, continue working in stockinette decreasing 1 stitch at neck edge until only 18st are on each shoulder.
Bind off Loosely.

BACK:
Work the same as the front, only without the stripe.
When the piece measures 12.25inches place a stitch marker at the end of each row (to mark for sleeves).

NECKLINE:
Pick up 44 stitches along the neckline with smaller needles (size 4).
Work as K1P1 decreasing 1 each end every other row for 5 rows in base color.
Bind off in rib stitch loosely.
Do the same for both sides.
Sew the two pieces together at the shoulder and neckline, but not up the sides.

SLEEVES:
Pick up 50 stitches, from the stitch marker on the back to just above the stripes on the front,
with larger needles (size 7).
Work in stockinette in base color for 3.5 inches.
Changing to smaller needles, work in single rib stitch for 4 rows.
Bind off loosely.
Repeat for the other sleeve.

FINISHING:
Sew up sleeve and side seams.