U need to miss ireland out .. get the UK visa and transfer thru london … UK visa is no good in dublin unless travelling from UK on the short stay waiver program
Going to be a challenge getting your Mrs a 6 month visa . She needs to prove there is intent to return to thailand and a reason . Ie a job
Applying for leave to enter which is path to permanent move would alternative but very expensive and not at all easy .. i assume she has not travelled much . Immigration want to see a busy passport .. an agent may be able to secure visa but not easy
The ask:thailand community, consisting of multiple Q/A groups with over 100,000 members, powers this platform. It is not an official government resource. Our members actively contribute to this resource, and while we strive for accuracy, we cannot guarantee its complete reliability. Assistance to travelers is provided as a community service.