My aunt is my math's teacher and it's really awkward can she hit me in front of my

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class? this happened 2 weeks ago. My aunt is my maths teacher. During her class me and my friend were laughing and talking and done 2 questions through 30 minutes of the period. My aunt sent me out to the corridor and said if you carry on talking and laughing you will get a spanking when you get home and will be grounded, when we walked back in she sort of hit me on my behind and told me to sit down. My aunt always says she will spank me but never does so obviously this time i wasn't going to believe her. Me and my friend continued to talk and my aunt shouted if you two don't get to question 8 by the end of this lesson you will be in at lunch so my friend finished it but i only got to question 5 we still talked during this though so she did let me out for lunch but when i got home she shouted me in to her room and told me to get over her knee and i put up an argument but that didn't work she basically threw me over and spanked me. Im 15 but i know this is legal in Scotland but did she have to ground me????