I'm just a girl...

When I asked the designer how much extra she would charge me for the lotus flower design that I also like, she said normally she charges $50 plus transfer fees but she'll let me just have it. Trouble is, I only have a small JPEG from her. I might want to have it silkscreened onto tank tops some day. Is it possible to have that JPEG re-done into an eps or some other better quality larger file for a silkscreener? Is it hard to do or would it cost me a lot of money to have done?

This is the size I have it in now:



Thanks in advance for any replies!