Apologies for the long post, but I am not sure what to do about DD and what may be causing her speech difficulties and whether any intervention is necessary. My DD will be 4 next month and is trilingual (2 home languages, different school language with some use at home).
When she first started to talk around 18 months and until 2 and a half she tended to stammer, especially the final sound of a word, though it could be the first too. We were based in DH's home country then and she mostly spoke DH's language though she understood English well. We then had a month long visit to the UK and she immediately began speaking English well and stopped stammering in both languages. After a month we moved to France where she picked up French, went to school, developed friendships and spoke all three languages without a stammer. She did largely stop speaking DH's language, though DH and I use it almost exclusively with each other and would speak English at home and French with everyone else. This isn't really relevant but she has always refused to use French with me and gets very agitated if I use it, even before she was able to speak. She is happy to use it with almost anyone else.
Six weeks ago we moved back to DH's country and at the moment are still living in a small flat with PIL. PIL are monolingual and only speak DH's language. DD initially spoke English and French with everyone, but has now begun to regularly express herself in DH's language, though she still uses English with me. She has been using less French but still seems able to understand it well and speak when needed. Around the same time as her fluency increased in DH's language and she began to use it more, her stammer returned but it is very inconsistent, doesn't seem to be triggered by sudden emotional upset or tiredness. Sometimes she seems aware of it and tries to fight it but mostly she doesn't seem to notice. She usually repeats terminal phonemes rather than whole words, though this does happen too.
DD has found the move away from France very traumatic as she left behind her school and her friends and we have transport issues here so do not leave the house as much as we should. PIL are elderly and fixed in their ways and often scold her or shout at her and this is something I am largely unable to prevent. She has begun to wet herself again lots although she seems outwardly content bar a few heartbreaking comments ("My friends are all lost", trying to call my DF to tell him we are not nice, wanting to go somewhere but "not knowing how to go").
I suppose in the first instance I am trying to work out whether her speech difficulties are symptomatic of her emotional upset/home disruption or the rapid reacquisition of a language (her stammer disappeared last time at the same time she stopped using DH's language) and whether I should wait and see how things develop or seek help now. Unfortunately help both for expressing her emotions and speech therapy will not be easy to find here, especially as she is more comfortable in English than the local language. Any ideas?