Hi everyone. Thanks for the advice.
I went ahead, opened it in V8 and resized it (ended up just slightly larger than 200%). It all looked good (being an ART file, although only ART B, but V8 handled it wonderfully), except for the outline around the eye - was just too thin as a line. So I deleted the original as suggested by Renata, and replaced it with a re-shaped oval. But I applied a thin satin stitch to it, playing with the stitch width until it looked right.
Hooped the fabric and a medium-weight tear-away, then tacked down a water-soluble on top, since the shirt had a bit of a nap to it. Isacord on top, black bobbin thread on the bottom (making sure to thread the BERNINA bobbin correctly for embroidery!) A few hours later, was done and looked great. Removed the tearaway, a quick wash, then a press with an OESD Pressing Cloth - worked wonders on the last wrinkles.
Daughter was thrilled - she thought that the shirt came that way! Guess she was happy, as she wore it to her 20th birthday party the next day!
Thanks again, everyone.