Addie is 23 weeks old and had gotten the hang of house training. Even let us know she wants to go out. The last few days she has been very reluctant to go outside because it's gone cold. She just sits down outside, looking at us to go in

. Well today we stood outside for 20 mins, came in and she peed straight away inside

Tried putting her coat on but she still just shivers.
What can we do? Its going to get so much colder soon