There may be 2 separate shrubs there. The plain green leaves with the pink flowers, looks like a Spirea.
He calls her the chocolate girl Cause he thinks she melts when he touches her She knows she's the chocolate girl Cause she's broken up and swallowed And wrapped in bits of silver
I got rid of one by cutting it to ground level, watching out for shoots and snipping them off. The plant eventually gets exhausted. It was sneaking under next door's fence, but it gave up in the end. The reddish brown suckers are easy enough to spot if that's happening in your garden too. It's a PITA but there are many worse weeds.
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The plain green leaves with the pink flowers, looks like a Spirea.
Cause he thinks she melts when he touches her
She knows she's the chocolate girl
Cause she's broken up and swallowed
And wrapped in bits of silver
https://www.google.com/search?q=spiraea+douglasii&client=firefox-b-d&source=lnms&tbm=isch&sa=X&ved=2ahUKEwi26NTzj-7qAhVfQUEAHS7uCh4Q_AUoAXoECBwQAw&biw=1920&bih=938