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Fortunately, I saved the game just after she met this 'dinner-guy',so she got the 'Love icon',(she was still a mistress aswell), but from then on I only let her work at the church for the remaining half year, to boost up her morals again.

This is random... but in case you ever save right before you make her grow up, and her morals are too low to get married. If you have enough money, and buy the spikey dress and put it on her, then immediately take it off, she'll suddenly have 30 morals. If you're using the cheats, you can do the same with the demon dress, but instead get 100.

It's a handy little trick.