Do settling in sessions. If she's used to playing at your friend's house, it should be fine, so just do a short session. Make sure you say goodbye, don't sneak off, but also make it very matter-of-fact, short, bright and breezy. I know a lot of people prefer to kiss/cuddle goodbye but I found that made things worse when DS was little, it was easier just to say "Bye, I'll be back" and walk off, smiling (while he screamed and reached for me :()
You can lose the smile when you're out of eyesight, but keep happy while she can still see you.
If the childminder is any good, she'll have excellent distraction activities as soon as you're gone and DD will be absolutely fine. I used to get my CM to text me when DS had settled, and it was always a reassuringly short time!
Stay nearby just in case she really doesn't settle.
If it's at your house, I wouldn't stay in the house unless that's how you're planning to do things long term because it will be more confusing and distressing for her that you're nearby but not coming to her.
When you go to pick her up, announce "I'm back!" - see here the link with the goodbye phrase, so she starts to associate the word with the meaning.
Also, as a general thing she might become more clingy and worried that you'll be disappearing a lot, so it's good to get into the habit of telling her "I'm just going to the toilet, I'll be back in a minute" (or whatever) if you leave the room and then announcing "I'm back!" when you re-enter the room.
Good luck!