I think she is a pretty nice looking heifer. Keep her people friendly, get her used to you touching her all around her belly and her udder long before she calves. Yep, grain works good. I have a method of making sure they come into a certain place and get their heads tied/chained or put in a stanchion and they learn that is the place they need to be for their "job".
Put a halter on her or a neck chain and then you can clip the chain to another short chain ...like a leash....so she knows that this is the place she needs to be.
All according to her "cross" she will make enough milk for both you and the calf probably for weeks in the beginning. You probably won't have to separate the calf in the beginning either. Thing is, if you leave the calf with her all the time, she might not want to let the milk down for milking, but you can get a feel for that. You may want to get a second calf for her to raise, then if you can't get to milk her, the two calves will take care of the milk. Biggest thing with any dairy cow is to find the balance so she doesn't get mastitis. If you go with a second calf and don't grain alot, then she will adjust to what is being "removed" and her production will lessen if she is making alot. If you do go with 2 calves, then taking them away for 12 hours or so....like locking them in a pen at night for morning milking, or penning them away fro the day to milk in the evening, will be the best way to go. If you only have 1 calf, she will probably make too much milk and you will need to milk her daily so she doesn't get mastitis. IT IS ALOT EASIER TO TRY TO PREVENT IT THAN TO TREAT IT. Plus the extra calf can be freezer beef or an extra for them to sell for their work....
I have 5 that I use as nurse cows....feed occasional orphan from the beef cows, mostly just raise 3-4 per cow per lactation plus all the milk I want for the house. Extra milk really raises some nice pigs too....