the wind is 7KT's forcast to decrease
According to the TAF, it wasn't forecast to decrease until after 5pm, which is after dark at this time of year. So that can be disregarded. The TAF reckoned the wind would be 16kts, and around 30 degrees off the runway heading....actually probably more like 35 degrees in reality, as the wind direction is true, the runway direction magnetic. You don't say how much experience you have, but that's a reasonable crosswind, especially for a low hours pilot. And forecasts are not that precise - suppose the wind increased to 20kts, and backed to 290 (and it did back, didn't it?). Not a lot of change, but now you have a strong wind by most people's standards, straight across the runway, and out of the limits of both what's stated for the C152, and more importantly, the limits for many pilots.
I think the school was being cautious, but not overly so.