Mine is the same age and goes through the night now 6 nights out of 7, but not always - though getting better and better, so I'm being patient. Puppy training at 6-7 months didn't seem to think there was any cause for worry.
It's really my fault as older dog was crate trained very quickly but puppy didn't initially like the crate so we put down puppy pads. We're still putting down puppy pads
. Though as I say, she uses them 1 night a week now at the most and getting better.
I find the key is a late night walk/ trip to the garden, and when I get up she has to go downstairs immediately (hard as I'm always desperate for the loo, but if I go first she runs to the puppy pads) and we're fine.
Trouble is I often need the loo middle of the night and sometimes that wakes her up enough that I think she needs it too. I could let her out but then I'll be doing it every night. If I sleep through and there are no disturbances, she never uses the pads. Like your dog, she sleeps with us.
If I haven't cracked it 100% by a year I will confine her more at night - I know she won't want to wet her bed or our bed.