We've moved across the country due to work and would move again if the right opportunity came up, anywhere worldwide really. Howevr, I have never had a big change of lifestyle, we've always moved to at least one secure job with the confidence that we would both be employed in a short time. But I plan and consider the impacts in detail, so I would also say I don't take risks. And I want to know what the contingency is, if things don't work out the way you expect them to.
You spend so much of your time at work and since you are the primary earner I think that needs to be the deciding factor.
But firstly you need to decide what kind of place you and your partner are looking for. Are you just looking for a place with more space and a view onto fields or the sea? Could you move within commuting distance of your current job? Or do you want wildlife in your back garden, or walks up mountains from your door, or do you want to be remote? If you are looking for remoteness, what are your priorities with regards to school/public transport/socialising opportunities for your daughter? She might prefer to be close to a relatively large town so she can get public transport to school, town etc and be a bit more independant of you as she gets older. And its also nice to be in or near a village with some amenities (shop, pub, post office) but some people would prefer the isolation of a property out in the sticks.
Then you can search online to find roughly where you might be able to get a job that pays enough for you to live on. And search online to find whether or not you can afford to live within commuting distance of said job (remember to double travel time estimates for rush hour travelling).
I agree with tonyd, if you can find an opportunity that could give you a better quality of life, then go for it. Just try and focus on what it is your partner is actually looking for.