The Plaid Cymru leader made the attack in her opening statement, accusing the Tory leader of being "too scared" to defend her record on the NHS and the economy.
Leanne Wood accused Theresa May of wanting the election to be about Brexit in order to avoid talking about the decimation of public services.
In her opening statement, Plaid Cymru leader, Leanne Wood, said:
"Although everyone knows that Plaid Cymru is all about Wales, the vision we have for our country; the values and the principles which underpin what we do, can benefit people in all parts of the UK.
"Wales faces some real challenges as we leave the EU, so we must grasp any opportunity to give Wales a voice.
"Plaid Cymru's Positive Post-Brexit Plan is an alternative to Theresa May's way.
"And I have a message for the Prime Minister - who I'm sure is watching:
"You may be too scared to come here tonight. For your U-turns to be highlighted; for your cruel policies to be exposed.
"You want this election to be about Brexit.
"Because that means you avoid talking about the NHS, the economy and the cuts you have made to public services.
"That is weak leadership.
"Weak and unstable.
"And I hope all of us here tonight will show you that real leadership means being willing to defend what you stand for, not hide from it."
Jeremy Corbyn also failed to attend the event saying he would only get involved if the Prime Minister was there.
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