10 year old, mispronouncing "r"s "s"s , the "th" sound,?

If you are in the US, she can get free speech therapy at school. If you have medical insurance, they may cover a few visits with a therapist, where you could get ideas on how to work at home with your child. I'm a speech therapist and I think it would be difficult to correct these sounds at home without the tricks of the trade demonstrated to you by a speech therapist, especially with that /r/. If you have any questions, you can email me, but definitely check with your child's school.

It sounds like the child has a lisp. She is probably putting her tongue at her teeth and incorrectly saying a sound. It is quite common in children and can be corrected, but it's important to correct it early on. There are tons of forms to print out online where you can spend 5 minutes a day working with the child and a lot of them consist of holding her tongue with her fingers while she pronounes a word correctly. She needs to be corrected on the way she pronounces the certain letters. Once she begins practicing and practicing overtime she will correct the problem herself. You will be amazed at what a couple of months can do. You can also contact her school, at no cost to you, and if she qualifies (which she should), she can meet with a trained speech therapist, during school, several times a week. You should find all the info below useful.

One of my best friends grew up with having what is called "lisp". Her, I suppose you could say, symptoms are similar to those you had listed. Some help-sites are listed under source.