Dd is 3.5 and has been potty trained for 16 months. She has gone through phases of wetting herself and pooing in her knickers but it has been really bad in the last few days, mostly with poos. Sticker charts used to work but she lost interest. We have started taking away her favourite toys. She has lost 7 or 8 so far but that lost its effect after the first 2 toys were taken away. Telling her she'll get them back if she stays clean and dry isn't even working. I took her to the doctors a few months ago but she said she didn't think it was a medical problem. Any ideas what might be causing this or what I can try?