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The first diagram is correct, 3u of blue buttons and 1u of red buttons. 

Later, after addition of 90 red buttons, 1/3 of the buttons were blue.

Pls take note that no buttons were added for blue, so in the end, there were 3u of blue buttons.

If 1/3 of total buttons in the end were blue, there were 3u * 2 = 6u red buttons in the end.

6u – u = 90

5u = 90

u = 18

4u = 72

So Daisy had 72 buttons at first.

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