how to start isabellas quest and how to raise str after the the dumbbells in your room
When Emily ask you to go with her to the Park, then you notice someone lurking around, go there again next day, to that lookout point up the hill, from there you will see her walking back to the parking lot, go down, she seems to have noticed you and so she goes behind the hut at the parking lot, follow her and she will be "introduced"

to you, after that you might find her at the first sign post in the park around midday, she also appears at the beach but there she is bugged and i would not recommend to talk to her there or you might end up in a black screen. I assume that you need to rise str because you failed to lift the bed while you helped Brenda cleaning the bedroom? If that is the case you will find extra weight in the garage, with that you go to your room and now when you click on the dumbbells you have the option to add the extra weight to them, do it an now you can rise str to lvl 2.