Maltese not coming when called/Letting us know she has to go out

We have a 5 month old female, she is very lovable and sweet. She was first trained to wee wee pads, now we are trying to train her outside. She will go outside, but we can't get her to let us know when she has to go out. I take her out every so often, and if I ask her if she has to go pee-pee, she will run to the door. But if I am busy or in another room and the urge strikes her, she will go on the carpet. How can I get her to let me know she has to go out? Also-- When she is outside she will not co me when we call her. She loves for me to chase after her and I can never catch her. I have tried bribing her with treats, whistling, clapping, nothing gets her attention except whatever she is currently sniffing. It is very frustrating to not be able to get her to come to me when i call. She chases my cats and will chase them up into the woods near our house, she has no fear of running far away from me. Any help on either of these problems would be appreciated. Thanks--

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