I've had dogs all my life and I've found that smaller dogs do seem to be more barky (not a word, I know).
I now have a one year old Cavapoo who will bark when I let her out into the garden, only for the first 10 seconds or so, then quitetens down, if your daughter's dogs are only doing this, I can't see much wrong with it.
I have a smaller yard area at the back where she can't see out and she's quiet out there, so I make sure I only let her out into the garden after 9am and before about 8pm, the rest of the time in the yard, to be fair to neighbours.
Some advise on bullying neighbours. When I moved here over 20 years ago my next door neighbour warned me that a neighbour across the road would soon be asking me to cut down the tree at the front of my garden.
So, I was ready for her, she came over and complained the tree was too big and blocked her light (I'd already checked and any shadow from the tree went nowhere near her house) so I just told her I loved the tree and no way was it being cut down, smiled and walked away. She's still across the road and not another word said for 20years.
What I'm trying to say is, tell your daughter to not be apologetic about the dogs, (unless they are barking non stop night and day)
and just smile and say, "they're only let out between 9 and 8 so as not to disturb anyone, and barking is what dogs do", then walk away. If she acts as if she won't be bossed around, they will get bored and back off.
She will have to be honest with herself though and if they're letting them out at 7 in the morning to charge around the garden barking their heads off, then they need to walk the dogs on lead at that time, to calm them down. They could also try going in the garden with the dogs on leads until they stop barking and only let them off when they've quietened down.
Long post but hope it helps, don't let them bully!!!