Ok this is the third time I've written a reply and manage to press something and lose the whole lot!

Thanks so much girls, she's read your replies and is feeling much better about it

She's had a rough time and has taken this as a criticism to her parenting

The HV said her DD was underweight and she wants to see her again in 2 weeks.
She's quite tall and slim, and Dad is slim too. I also forgot to mention in my original post (only a minor detail!

) that she's been quite unwell for a little while too, so that wont have helped her to gain weight.
She's going to do what she can to up the calorie intake, but I think we've convinced her not to panic