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As a Finnish Citizen, your wife does not require a visa to enter the UK and stay here up to 6 months but to apply for the spouse visa, she must apply from outside the UK, an applicant can not switch to a spouse visa while in the UK as a visitor.
Preferably not, she needs to wait for the decision and come to the UK once the decision is made
Please do let me know if you have further questions
An applicant can apply inside the UK but someone who is in the UK as a visitor can not switch to a spouse visa.
I hope it answers all your questions, please let me know if you have further questions and I am happy to help. Thank you