Lots of players have been having issues with unlock Jillian, so TinyCo has just released a fix:
“Crashing when unlocking Jillian? We just pushed a fix for this! Thanks for your patience as we worked to resolve this crashing bug. We have a fix for all unlocking-crashes in the 1.6 update. We wanted to get a fix out for Jillian first due to the New Year’s content. Hope this helps!
How are you guys liking Week 2 content so far?”