How does Amy get turned into a peg doll into doctor who?

After mr purcell got turned into a doll they chased Amy and Rory into the kitchen the dolls almost got through but Rory blocked up the door with a giant leather barrel but then they was trapped then Amy thought of an idea it was their only chance but it totally backfired she said the only thing we can do is letting them in and then she said we would surprise them push past them punch them kick them anything so Rory got a mop Amy got rid of the barrel and the first doll was pushing on the door so hard that it fell over Rory barged past the other one with the mop Amy followed but when amy was running past the doll stuck out it's arm and Amy fell in it and got turned into a maid doll.