My older sister came back "close family-first cousin".
What does this mean?
Shared DNA 1961 cM across 74 segments
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DNAPainter says that 1961cM probably means one of the following:
I'm guessing that you can rule out grandparent and grandchild :-)
From The Shared cM Project 3.0 tool v4 for 1,961 cM it would seem that you are more likely to be a half-sister or niece (your age difference may help distinguish which) than a full sibling.
Full sisters seems unlikely because at that page the expected range for full siblings is 2,209 - 3,304 with the mean at 2,629 cM.