Have they? How? Who are you suggesting they've 'bought'?
And why would Poland have anything 'to fear'?
Poland and Qatar have good relations; I was a guest at the Polish Embassy in Doha when the First lady visited. There was another PF poster there too and it was nice to meet him; we've stayed in touch and are good friends now in real life.
She's been arrested and the matter is currently under investigation. Personally, I suspect she's guilty, however time will tell. As far as I know, it's just cash for lobbying.
Hard to know how this relates to Poland, or specifically to German/Polish relations.
Home / History / History of two Neighbors: Poland - Germany Interrelations