This is the 16187th most frequent Russian word.
расклеивающая
"Расклеивающая" means "gluing" or "posting" (feminine, present participle).
Here, "расклеивающая" is used as a present participle describing someone actively putting up advertisements.
Она была расклеивающая объявления на стенды.
She was posting advertisements on the stands.
In this use, "расклеивающая" functions as an adjective describing the surface that is peeling off.
Клеящий раствор расклеивающая поверхность исправит.
The adhesive solution will correct the peeling surface.
"Расклеивающая" here denotes an action being done by the girl, i.e., actively putting up posters.