I think you're right. Here's how a strong SP could look, score-wise, based on some of the best performed elements in Sochi:
3Z-3T - 11.7 (10.10 (Yuna's combo BV) + 1.6 (Adelina's combo GOE) for mostly +2 and a few +3)
3F - 6.7 (5.3 (Yuna's BV) + 1.4 (Carolina's solo jump GOE) for mostly +2's)
2A in bonus - 4.7 (Yuna's 2A)
L4 Steps - 5.4 (Adelina's)
3 L4 Spins - 13.26 (Julia's Team SP)
That is a TES score of 41.76. A skater would then need 38.24 in PCS; neither Yuna nor Caro surpassed 37 in Sochi. So with this layout, performing the elements beautifully and having the best PCS won't get a skater to 80. She must have the 3A.
She can backload all 3 jumping passes in the second half to earn an additional 10%. about 2 more points.
PCS in the 36+ would do it.
I think if Adelina does 3Fluz-3Loop, 3Flip, 2A + all level 4 + Sochi judging, she would break 80.