The only problem I've found with Lingling is that since her animations are quite long, she gets interrupted A LOT. For example, I put her in a Mystic Ruins team, she started cooking and one of those archers from the enemy team's back row kept shooting arrows at her and interrupting her actions every single time, she was not stunned, just interrupted, and then tried to use her first ability again. At the end of the short fight she ended up with 0 damage and 0 heals, she contributed absolutely nothing to the team.
Since her animations are generally longer than most characters', maybe they could be made uninterruptible (except for stuns and other forms of CC of course) so she can take damage for attacks received, but be able to actually do something and not just stand there, taking free hits all the match.
Just my 2 cents.