Seeing as your daughter's 8 years old and has started at school, maybe you could take this opportunity to get some part time work or get involved in voluntary schemes in your community.
Either of these options would help you to get out of the house and meet new people whilst also learning new skills and being part of something which would give you a sense of achievement - something that you've done for yourself that's separate from your family life.
You could also look into social groups like book clubs - they're an interesting way to meet people and discuss new books which would be fun.
I know my mum found it hard being at home all the time with us kids but now we're all older she involved herself in a part time university course, as well as taking other classes. Day or evening classes are a great way to meet new friends and learn something new, I know it really worked for my mum.
hope it helps