Trying to set and old computer for my mom

Hello, My mom is a kindergarten teacher and is in need for a computer where she can edit some .doc, .ppt and images that she uses for the kids to paint, write, etc. I have an old laptop that has very low specs, problably 1gb ram and some Pentium processor. The thing is: I tried installing some light ubunto that looks like windows, but I`m not being able to donwload and install some softwares that read ppt and .doc. I very new to linux in general, and would like some help to find and isntall the software.

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Please, can someone provide me some info on which and how to download and install, bec most softwares that i`ve tried I failed to download or install.

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thanks