Hi,
I do have experience with both, online dating (but whitin my own country of origin) and marrying in Uganda (but we came to know one another physically in my country before moving back to Uganda).
First of all, she is 25, the more hostile you are, the more defensive she might get. my parents where not happy when I planned to travel to Uganda for marriage after just 6 month of physical relationship. I was 21.
Now we are married since 14years.
I suggest you get interested in her and what she loves about him. But obviously anyone would not recommend to marry anyone after just 1 day of physical meeting!
Let them find out how to spend more time physically whith one another before deciding about marriage. And also whennit comes about deciding where to live, it is advised for any party to first visit the place before decision taking.
And.... Find out if there are any online groups or "real" associations for guiding in binational relationships. The least they can give is psychosocial support how to go through the stress of bureaucracy and uncertainty when planning marriage aknowledgement in both countries but ours here in Switzerland is quit helpful in informing on financial issues, aknowledgement of foreign diplomas, organising exchange meetings etc.
I doubt such an association to exist in Uganda, maybe that is how you ended up asking here. When I first went I got in contact with my consulate even before departure. They replied but were quit concentrating on their business bureaucracy just.
Although I knew my spouse already 6 month, I could not know how he might be in the different environment. I had my sister following me after 2 weeks for a visit of 3 weeks and attending our wedding. Also I foundnit important for myself to have a "second address" like the embassy, or in my case a volunteering job I organised in advance. just to have someone else to speak to/ to reach out to in case there was any problem. -which obviously did not happen, we are fine together, and finally I never started to work with that organisation because our expectations finally did not meet.
Generally try to stop judging the relationship based on the mans origin or passport, but based on facts. They have met 1 day?! She does not know the place she is going to?!
I hope this is a bit helpful to you.
Best regards.