Try taking her out side, waiting for her to perform then bringing her back in and putting her in her bed for a few minutes, she shouldn't be going to the toilet in her bed, and take her back out for a second go.
My Lilly I had to make sure I took her out twice, even now (she's 18 months) in the morning we go out for a wee and then I take her back out for a pooh otherwise she'll sometimes have an accident.

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A dog Possesses Beauty without Vanity,Strength without Insolence, Courage without Ferocity, And all the Virtues of Man without his Vices.