She Cried!

The proposal went great, she was so happy and cried for about an hour. She absolutely loves it and people can't believe how much it shines in any amount of light!! The only problem which isn''t a huge one is that she has tried on many rings and has been sized to a 5.5 but this one slides on and off without any trouble and sh''e afraid she''s going to lose it. Is there anything I can do to remedy this? I know you mentioned before that it could easily be adjusted but I''m not sure what course of action to take. If you could get back to me I would appreciate it, thanks!!