She was at the inbetweenie stage of her career, not quite a beginner but not yet an expert.
inbetweenie phase
Frequency:
60
%
He was going through an inbetweenie phase in life, not sure where he belonged.
inbetweenie size
Frequency:
45
%
The dress was an inbetweenie size, not quite small but not quite medium.
Idiomatic Expressions for inbetweenie
Phrase: inbetweenie stage
Meaning: a transitional phase or period of uncertainty
Usage: The project is currently in the inbetweenie stage where we are waiting for feedback before moving forward.