A friend of DH (not his closest, ex colleague but they meet up several times a year despite living in different cities) has a girlfriend who is just starting up her own business as portrait photographer. They have been on and off for over 10 years, and she recently moved in with him in the other side of the country after losing her job. I have never met her, but am in very good terms with DH's friend. DH has met her once or twice back in 2000.
When DS was born, friend mentioned that his girlfriend would love to take some pictures of him when we meet and it would be good for her practice/portfolio building up. While we don't mind her taking photos (i.e. practising), we are not comfortable with pictures of DS being used on a website or any demonstration purposes. We gave a vague OK as we were living abroad at the time.
It's not something we'd choose to pay for-We did not have a professional photographer at our wedding for example.
On Christmas, they sent us a card with a gift voucher for a portrait photo session for DS. When we saw DH's friend for a drink in January (she was not there) I said to him that they are most welcome to visit and stay over for a weekend, but I did not mention anything about photos.
DH is currently working long days and weeks, but had a weekend off a fortnight ago. He suggested that they visited to have a nice day out. We live a couple of hours drive away.They said they'd come for the Saturday only. DH sent out directions for driving to and parking in our area, and got reply with attached instructions for the photo shoot session (!) He sent an email saying that it was his only day off and that he thought he'd be relaxing with friends, not stressing over getting the light right. Plus DS is now a constantly running toddler, with zero chances of him staying still posing.
His friend called immediatelly to say that of course they'd come to see us and he'd ask her not bring her camera at all. DH said that she should bring it, just we were not intending to spend the whole day taking pictures.
On Saturday morning friend called us and said they were not coming after all, because she was not feeling very well (a cough or something).
We were left a bit
and 
Could the MN jury please enlighten us with your thoughts?