Memory Issues

Hi, I am having issues with one of my sites. There are errors on the backend whereas if I go to the plugin page (and others) for instance, I get this page…

This page isn’t working
williamsresidentialdesign.ca is currently unable to handle this request.
HTTP ERROR 500

I also tried updating WordPress and it failed. Further, when I go to edit a post, the content is missing in the post editor.

I checked with the server support (Cloudways) and they said they were seeing memory errors in the logs. See below:

[proxy_fcgi:error] [pid 1373] [client 127.0.0.1:35883] AH01071: Got error ‘PHP message: PHP Fatal error: Allowed memory size of 100663296 bytes exhausted (tried to allocate 320705 bytes) in /home/99329-78634.cloudway…mes/enfold/css/dynamic-css.php on line 948\n’, referer: https://williamsresidentialdesign.ca/wp-admin/post.php?post=1650&action=edit
[Fri May 25 14:14:53.068436 2018] [proxy_fcgi:error] [pid 1774] [client 127.0.0.1:36226] AH01071: Got error ‘PHP message: PHP Fatal error: Allowed memory size of 100663296 bytes exhausted (tried to allocate 320705 bytes) in /home/99329-78634.cl

My understanding is this is a theme issue. Can you please let me know if you can help? Login credentials included.

Thank you