How do I ecourage my spouse, in Mandarin, to fly free in her job, and assure here we are supporting her and welcoming her home
Update:
恭喜你找到梦寐以求的工作。我真为你感到高兴/自豪。努力去做吧。我永远支持你。
Congratulations on getting your dream job. I feel happy/proud for you. Go for it. I will always support you.

I guess your spouse may have obtained a position (职位) / job (工作) as a crew member (机组成员), such as

pilot 机长)
co-pilot (副驾驶)
cabin manager / flight purser 客舱经理 / 乘务长
flight attendant 空中乘务员 (空乘 / 乘务员)


加油！自由飞翔！我们在这里为您服务，始终支持您并欢迎您回家！

It's grammatically correct, but people don't normally say that.
我们在这里为您服务 is equivalent to &quot;we're here to help&quot; which is used in customer service rather than family.
始终支持您 also sounds like an expression in customers service.
您 is used in clerk to supervisor, store to customer, student to teacher. No need to 您 between spouse. For other situations in the family, it depends on their family consensus/tacit understanding.
You can say:

恭喜你被录用！太好了，你的梦想成真了（your dream comes true）。我期待看到你在蓝天翱翔（áoxiáng）的样子。