GIMP photo editting - How do I make a selection blend in wit

[Bear]

I am using the GIMP Photo editing software, and I need to edit a girl out of a picture. She about 5 mm tall, and surrounded by grass. Ideally, the grass would extend over the length of the field, and where she is crouching would appear as grass as well.

I am aware that I could
(1) copy a section of grass and paste it over her or
(2) do a Gaussian blur to blend her in with her background

Is there a better way to make her blend in with the grass?

Thanks!