Advice for a fair weather doggy

I have a Miniature Dachshund who's nearly 12 now and I'll be honest, she's quite a princess! She refuses to go outside when it's wet on the ground or raining which usually leads to some mess inside. I have a Golden Retriever as well who is always up for going outside whatever the weather. I always leave the back door open for them to come and go as they please into the garden. Does anyone have any advice or tips to help my Dachshund become more accustomed to going outside when it's wet so she's more likely to go outside when she needs to?