Long story
Bit of background
I often have my close friends daughter, 12 yrs old (will call child A) for the weekend as she does not always like going to her dads, I've always been fine with it. Recently had her for 10 days so her mum could work and so she didn't have to go to her dads.
When she's here she shares a room with my daughter (child b)
Recently child A has been stealing from her mum, vapes, jewellery and even sex toys (mum confirmed she found these in child A's bedroom)
When she stayed at my house her mum asked me to go through her bag, to which I didn't want to but a quick check found x2 vapes x1 pocket pleaser, which mum confirms was hers.
Now here's the bit we're all struggling on. When child A got home, her mum went through her bag and found a bracelet and ring, which are mine that belonged to my mum before she passed away. I was and still am genuinely hurt at the thought child A stole these things.
Whilst child A stayed with us, my child was at the childminders whilst I worked from home, so child A was upstairs a lot of the day unsupervised. On one night I asked my partner if he'd been in my bedside drawers as I found them slightly open thought it was strange and passed it off.
But since child A's mum found MY jewellery in child A's possession. Child A is completely denying it. Her mum is now believing it is not her daughter who's done this.
I've spoken at length with Child B (my child, 9) and she is denying it also, her dad has spoke with her, her auntie and the childminder. And we get the same story. I believe my daughter and refuse to question her any more as I don't want this to affect our relationship.
I've told my friend that child A will not be welcome here any more as I cannot risk it. I need to know the truth. Child A's mum believes it wasn't her daughter and I feel that this is now going to ruin her friendship.
I've now got said items back, and told her I'll drop it now as I have them back, but child A is no longer welcome until I know the truth. Is this too harsh or what would other people do?
It genuinely has ruined my week but I'm glad I have the items back now.