How old will she be when she calves?
We've just had a teenage pregnancy, a British Blue x heifer to our bull (an Angus.) She's calved at 17 months. She needed help calving - a strapping great calf - and it needed support for a few hours having had a difficult birth, but apart from that all has been well. We were worried she wouldn't have enough milk so had been caking her for that, which may have been a partial cause of the calf being large, of course. So far, one month on, with plenty of cake and good hay plus grazing during the day, she is managing very well - and the calf is a stonker!
(Mum is called Wanda, partly because she was born in the winter indoors, and used to wander about at will, and partly because when she was young her tail hairs fanned out and she looked as though she had a fish tail.)