Thank you, any suggestions as far as saying YES or NO to her joining my group?

I don't really want her there as this is my escape, my happy place. But I don't want to be rude or mean.

M35 W33 S14 D12
M14
ILYBNILWY 07/14
BD 7/14
S 5/15

"For I know the plans I have for you,” declares the Lord, “plans to prosper you and not to harm you, plans to give you hope and a future"