Thought you might like a perspective from 'the other side' as it were.
I work one to one with a Y3 child and I meet his Mum and chat about his evening and night every morning, fill in a home/school book for the day, send examples of work done that day home (to be returned but so that Mum can see what is going on) and meet Mum at the end of the day to talk about his day too.
I had a complete set of hand over notes when I started working with him but have asked Mum for more info if she has it. She also encourages me to do any training necessary and gives me copies of useful articles or courses she's been on. We also discuss ideas for how to deal with him if he is anxious at home or school, and swap ideas on rewards, which areas to work on more or less intensively, SALT recommendations, up coming changes etc etc.
I would say that you need to make sure from the start that you have given all the info you can so that she is as well informed as possible, and I would start encouraging her to go on the necessary courses asap. Especially the ones that will help her communicate better with Lottie and help Lottie with her learning. I'm not SN trained either, but the child I work with is autistic and my DS has just had a dx of autism so I have some 'practical' experience hence a bit of a head start. But I've had to look at training courses and do lots of reading to keep up with his needs and help him work in school and with others especially as his autism is different to that of my DS.
Hope this has been of some help, and hope that things go really well for you and for Lottie.
Lots of love,
WMxxx