Where does “pionierka” come from?

pionierka (Polish) comes from Polish pionier, from English pioneer, from Middle French pionnier, from Old French peonier, from Old French peon, from Latin pedō, from Latin pēs, from Ancient Greek μέτρον — Derives agent nouns from verbs, denoting someone...

Ancestry of “pionierka”, step by step

Step	Language	Word	Meaning
1	Polish	pionier	pioneer, trailblazer
2	English	pioneer	One who goes before, as into the wilderness,...
3	Middle French	pionnier	infantryman
4	Old French	peonier	foot soldier
5	Old French	peon	pawn; footman; a foot soldier
6	Latin	pedō	—
7	Latin	pēs	a foot, in its senses as
8	Ancient Greek	μέτρον	something used to measure: measure, rule, weight;...
9	Ancient Greek	-τρον	Forms instrument nouns
10	Proto-Hellenic	-tron	Forms instrument nouns from verb stems
11	Proto-Indo-European	-trom	Forms nouns denoting a tool or instrument
12	Proto-Indo-European	-tḗr	Derives agent nouns from verbs, denoting someone...

Every word from Proto-Indo-European -tḗr →Every word from Ancient Greek -τρον →Every word from Ancient Greek μέτρον →