Personally dont like this - she generally spread her signature on photos and this seems unusually bunched together and a number of the letters are uncharacteristic, even when she was in poor health later in life.
That is a copy still? I really can't tell. Image corners are sharp. Image might be 2nd gen though - can't say from the scan. I don't see any negative number for a production still etc. I would prefer a vintage still with a preferably vintage signature - but that is me.