you will always worry about her. no matter her size
my Layla was 3lbs when she was spayed and she did really well... She got to come home the same day and took 3-4 days to be back to her normal self... the first night was the hardest beacuse she couldn't stand up to pee or tell me when she needed out... as you will read on many threads here... get a baby onesie to put on her instead of the e-collar..