Hi Mum901. I'm a lone parent too and because of my own personal circumstances I was isolated. It is very hard. Here are some strategies that helped me. I hope some of them will help you too.
Babies, toddlers, young children need sensory activities for example water play, finger painting, sand, etc. I filled up a tub of water and plastic cups for pouring and sat outside with her. I took her to parks and playground. She could pick grass, leaves etc. dig in the dirt, sand, tan bark, while I had a coffee and relaxed. (I still kept an eye on her to make sure she didn't eat a poisonous plant or choke on a piece of bark). Getting outside time and some fresh air might be what she needs. And you'll benefit too. I made play dough so it was non toxic and didn't matter if she put some in her mouth. I bought a plastic kids table, covered it with butcher paper or those rolls of paper for painting at an easel, that I secured to the table with masking tape. Then gave her a large crayon (the ones for young kids that are washable) to draw with. I started my daughter with a black crayon because the contrast between black and white stands out to young children and she'll be interested in the lines she's creating. Eventually I introduced her to primary colours and then secondary colours.
Sometimes I played with her and sometimes I set her up to play by herself so that I could get a rest.
I also bought paper plates so I could cut down on dishes and a lightweight swivel sweeper that made cleaning up multiple messes on the floor easier.
Sensory play helped me too because sometimes squishing play dough relieves stress.
I also bought her percussion instruments like maraccas, egg shakers, tambourine, xylophone etc. Young kids love making music. Put your favorite CD on and have a dance or sit back and chill. A bit of background music can change the atmosphere.
All the best. 


