What do you do when your friend has let themselves go?

One of my good friends and fellow geek had let herself go. She works from home and over the past few years has lost interest in her life. She no longer went out unless it was to the comic book store or to pick up groceries (and to do any other basic shopping). She really stopped taking care of herself and her apartment was a mess. She was never a girly girl but she had her own style and did have fun when she dressed up and especially when we all went out.

But gradually over time she just stopped wanting to do anything besides working, reading comics and playing video games. We talked to her and tried to see if there was something that either happened or changed in her life that we didn't know about. No changes in her life, she just didn't feel like making the effort. She even stopped dating. She didn't seem sad or depressed, just her normal self but without taking care of herself.

Do you guys remember that episode of The Big Bang Theory when Penny became obsessed with playing video games. That's exactly how she started to look whenever we hung out with her or stopped by to see her.

I guess up until now she wasn't ready to change but a few days ago, she started to work out (she had gained a bit a weight from eating a lot of junk food, fast food, etc). She's even talking about getting herself a bike.

The two of us even have plans to get a mani/pedi in a bout an hour, I usually do my own nails. However, the fact that my friend is finally starting to get out of her cocoon I consider it worth the splurge. Later on, she's even going to go with some of us to see the movie Home, I consider all of this great progress.

To answer the question I posed in the title, what do you do when your friend has let themselves go? My answer would be unless it's something really serious they're dealing with, give them time to get themselves out of their own rut.