2,111 is the Santan Flowers she picked.
Step-by-step explanation:
Subtract the total flowers Elly picked which the 3953 flowers to the 1,086 daisy and 756 roses.
Add the 1,086 and 756 the sum of it is 1,842
Subtract the 3,953 to 1,842 and the difference is 2,111.