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Thanks for your answers. We've bought some plug-in repellers and some traps today, and will do lots of hoovering.
Have to say it's difficult to stop her putting things from the floor in her mouth, as she likes to put everything in her mouth! Also, as soon as I've washed her hands she's crawling around on the floor again and she constantly puts her fingers in her mouth. So it is quite worrying. Like you say I can't stop her her crawling on the floor, and likewise I can't stop her from sucking her fingers, so it's a difficult one :?(