hmm…it sound to me like the management is giving you a test if you can perform at a higher level and at a better efficiency rate than you were before (by giving you more work to complete). and giving you a coach could just mean that they may have hope for you yet, or as you say, they may be transitioning your job to your coach.

the safe route to take would be to look for other jobs, JUST IN CASE. but don’t let your manager know that you’re looking, in case you’re wrong and they’re keeping you on. and regarding the team members that moved on, leaving you and another girl, it may not mean anything. they may have different plans for you…

good luck!