I am sorry that your question was unanswered for long.
The vaccine is about 62% effective in preventing flu. As for who should get it, definitely people over 60 and toddlers and anyone with significant lung disorders or other medical conditions, should get the vaccine. Even people who are exposed to flu; should get the vaccine. Since your friend does not clearly know about the cause of infection 5 weeks ago, there is no harm in getting the flu shot. Since she has recovered from UTI, she can be given flu shot.
Please feel free for your follow up questions.
I would be happy to assist you further, if you need any more information.
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